I acquired one of these keyboard earlier this week.
I ordered the barebones TKL version.. which for the price (with referral code) of about $60 is very reasonable.
As has been said elsewhere, the stabilizers are pretty terrible out of the box. Clipping and lubing them improves them greatly.
The board itself is mostly metal, with a small plastic back. There is a very tiny amount of flex in the case if you try and twist it, but it doesn't result in any sort of squeak or creak. If you weren't looking at it closely enough you would not even notice that it could be twisted slightly.
There is a bit of a hollow ring to the keyboard as is.. The case is easily taken apart with easily accessed screws on the top of the board, with no plastic clips.
The inside of the board is *very* cramped, If you're looking to fill it up with some stuff to deaden the noise, it will be a bit of a pain to get it all to fit.
I was able to get the board sounding *much* better with about 1 hour of work, dealing with the stabilizers, and filling what I could into the bottom of the case.
For those looking for a big fancy switch tester, this is a great board.
For people who are used to fancy customs maybe you'd be let down a bit..
If you're willing to either mess a bit with the stabilizers, or replace them with better ones,.. and address the hollow sounding case.. this board is a very serviceable board and I would say it is worth a buy.
(I am using SA caps and NovelKeys Kailh Box Heavy 'Pale Blue' switches on my unit, cannot say if the board is pleasing on anything else, also I have zero interest in the rgb lighting stuff, so cannot comment on if that is any good)
If I had any suggestions for manufacturer: Leave some more space in the bottom plastic case area so that folks who desire it can stiffen things up a bit in terms of acoustics.. or to add weight if they're into that sort of thing... Also, use better stabilizers (or at least perhaps pre-lube the ones already offered?)