Overall: Practically 5 out of 5 (see "Bluetooth" below for my main caveat).
I've been using this keyboard for a few weeks now with wrist pads, and I love it.
I got this keyboard after extensive research and trying out some other keyboards (ex Mistel MD770). My main priorities were a) something that relieves carpal tunnel pain and b) doesnt break the bank.
My main recommendation if you are considering this is a) get the wrist pads and b) do a test run with an Amazon version as they have a better return policy, then come back and buy it here.
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Ergonomics (5/5):
In my view, the most important choice you can make for ergonomics are a) a split layout and b) wrist pads. Everything beyond that (I recently switched to the Colemak layout and experimented with tenting) seems to me to be a difference in degree, not kind.
In addition to the split design, I love how the Alice layout almost seems to reduce the size of the keyboard relative to my hands (medium size for reference). It virtually eliminates reach, and is not difficult to adapt to.
Feel/Action (5/5):
The typing action is a dream, and the doubleshot keys have a very nice feel.
Each row of keys is a slightly different height, which turns out is quite nice for finding where you are on the keyboard and prolly easier for typing as well. While it is a minor bummer I cant move them around for the Colemak layout, it doesnt actually impact my use and wont be an issue for the vast majority of buyers.
I chose the brown switches, which I combined with o-rings as I work in a shared office space. Without the o-rings, the keyboard is too loud. With the o-rings, it is quieter than most other keyboards in the space. I did try the cherry mx silent reds on a different keyboard, but I didnt really like the feel.
Macros/programmability (4.5/5)
I am not big into macros, so my views are prolly limited here. It doesnt work with VIA, which isnt a big deal to me personally.
I LOVE the fact that it has Colemak built in. I have used it with other laptops/computers, and it is super convenient to switch to Colemak. I can also see how having different layers are helpful, but that is outside of my usecase personally.
I like the fact that you can hardcode switching the fn key with capslock, which I recommend doing.
Bluetooth (3/5):
I tried using the bluetooth connection for a while ultimately to revert to wired. The bluetooth just isnt worth it; it doesnt wake my laptop on its own, takes 5s or so to reconnect to it, and suffers from a delay that is noticeable at 60wpm.
I dont know if these issues are because of my laptop, if that is a common issue for bluetooth mechanical keyboards, or specific to this keyboard.
As I think, however, that most people will likely use this as their main keyboard and thus prefer to plug it in anyway, I am not factoring this into my score.
Stray thoughts:
It has magnetic feet which you can move around as you please.
It has RGB; I just shut that off and never looked back as I dont need the frills.
It has two "B" keys, which I did not notice till the 2nd week of use.
If you ever wanted to join the halves together (why would you?), you can join them together permanently with screws. Kinda pointless imo as the jigsaw design seen in other split keyboards seems better, but joining together in general is kinda pointless so eh.
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Bottom line:
Highly recommended.