I have to say I really like the look of the Oro Zero, it looks like they've really given Niche a run for their money with this grinder, although it's early days and the proof is in the pudding, which is a really weird saying. The only thing I have to say negatively is that I think it's a shame that Eureka didn't keep the touch screen programmable doses from the Mignon XL on the Oro, for anyone who wants that feature. The Grinder Go uses Timemore’s patented E&B (espresso and brewing) burr set, which has some teeth on the breaker of the inner burr. The teeth crush the coffee beans into tiny particles before reaching the lower blades. Meanwhile, you can buy a high-quality electric grinder, such as the Baratza Encore, for just a bit more money. However, if you’re specifically in the market for a battery-operated coffee grinder, alternatives to the Grinder Go and 123Go are limited. The perfect AeroPress grinder should be able to produce a consistent grind size to ensure that all the coffee particles are of the same size, resulting in a uniform extraction. If the grind is inconsistent, the water won’t evenly distribute and you won’t get a balanced flavour. Burrs vs Blade

So just keep in mind, while I do think any way of grinding your own is better than pre-ground (and infinitely better than instant), but if you can afford to spend a few more quid on a burr grinder, I think you'd be making a wise choice. Grinding Wheel Grinders The first thing to say about the DF64 is that it's a flat burr grinder, vs the conical burrs in the Niche Zero. The Zero has 63mm conical burrs, the DF64 has flat 64mm burrs. If you're someone who has a particular preference for flat burrs, then this may be something that draws you towards this grinder. I can't tell the difference in the cup between flat and conical, so it's not something that would make a huge difference to me personally.

For brew methods like pourover, filter coffee machines, Aeropress and so on, you'll be able to grind fine enough, but still, I'd recommend going for a grinder with proper burrs if you can, as the improved particle uniformity these will provide, should translate into better cup quality.

For AeroPress, it is recommended to use a fine-to-medium grind size. Can you use a blade grinder for AeroPress? Via the Smart Grinder Pro, I was able to get great results, with plenty of range left (I was around at about setting 16, so nowhere near finest). With the Krups GVX231 and the De'Longhi KG79, I couldn't get anywhere close to acceptable via standard baskets, so very under-extracted espresso. Doser grinders are the grinders you'll be familiar with from seeing baristas in cafes frantically flapping the doser lever to dispense coffee that has already been ground and is sitting in the doser for fast access for the next few shots, and these kinds of dosers aren't really suitable for home use. The choice between a flat or conical burr grinder depends on your coffee preferences. If you enjoy sweet-tasting coffees, a conical burr grinder is recommended. On the other hand, if you prefer bitter coffees, a flat burr grinder would be a better choice. 3. Is a bigger burr size coffee grinder better? In fact, I think there was only one area the Zero initially came up short on, which was popcorning. When you grind the last few beans in the hopper in any grinder, you'll usually get a bit of popcorning where the beans fly around because there's no weight of other coffee beans feeding them into the burrs. With a single doser grinder, the latter part of the grind is always going to end up popcorning, and in theory, this could lead to less uniform grounds, although it'll only ever affect the last couple of beans so it's probably not a huge deal anyway.This is an interesting grinder from Melitta, for the price, it's the cheapest GBW (grind by weight) grinder on the market. The scales aren't the most precise, I've found they can be out by around a gram or so, but still, it's an impressive feature for the money, and for most people being around a gram out in a 30-gram dose really isn't a massive deal. The Eureka Mignon Oro is the first real contender I've seen in terms of a grinder aimed at competing with the Niche Zero. Features:

They dealt with this issue well on the new version, with an adjustable portafilter cradle and adjustable grinds container cradle, allowing the grinder to compensate for the instability. They also tweaked the new I version so that it automatically adjusts to counter offset, which means that for example if you set it for a 21g dose and you get 21.2g, over the course of a few shots it'll tweak this automatically so you start getting closer towards the exact dose. The one thing most (there are one or two exceptions) of these grinders have in common, though, is that they're all-rounder grinders, not specialist grinders, and most of them won't work with espresso with traditional baskets, which requires a finer grind. Mid Range & Upwards Burr GrindersOur list consists mostly of conical-burr grinders. In a conical grinder, coffee beans are crushed and ground between two rings of burrs. They deliver a finer, much more consistent grind than you’d get with a traditional blade grinder, even the nicest ones. With the second generation gearbox, the Encore is more durable and quieter than the first version, and Baratza apparently did some really vigorous testing of the failsafe built in to stop the grinder from breaking if foreign objects end up in the burrs, by trying to grind metal screws, which lead to everything stopping instantly and the thermal cutout being triggered, with no damage to the gears or the motor. One thing that surprised us about both machines is that the 86mm diameter makes them considerably larger than expected. It is still portable, but both machines are larger than most hand grinders. This is because of the storage space needed for the motor. Make sure the work area is clear of flammable products and that combustible dust is not allowed to accumulate. I've used this grinder, and while being completely honest I don't think there's a massive difference in grinds quality and therefore cup quality between this grinder and some of the cheaper 40mm conical burr grinders, the build quality is noticeable better with the Svart vs some of the cheaper, similar grinders – I also think it's a few decibels quieter than some of the cheaper options, but the main reason I'd go for this grinder in a heartbeat vs the cheaper generic brand grinders, is the build quality and the warranty situation.

This was a long time ago, of course, and the Melitta company has come a long way since then, but they're still in coffee, producing bean to cup coffee machines, filter coffee machines, and more recently coffee grinders. This looks like a smaller sibling of the popular DF64 and DF83 single-doser grinders and is sold by Turin & Miicoffee who also sell these grinders, but it's actually produced by a different Chinese manufacturer, so although this is an interesting grinder for the price, it's worth noting that it's not actually related to the DF grinders other than being sold by a couple of the same brands who also sell the DF64 & DF83. Wear appropriate eye, ear and face protection. Use other personal protective equipment or clothing, as required under the circumstances. This could of course be that it's two users using different espresso machines and very different coffee beans, but it could also be an indication that the newer models will grind much finer, and it could be that the person singing its praises (who bought a few months later compared to the other guy) has a newer model with the finer grinding ability.

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If you travel a lot and make coffee on the go, a manual grinder is ideal and a cheaper alternative to an electric one.