Had this keyboard with Matias Quiet Click switches for two months now. Very happy so far! No issues installing QMK, and no issues with the Matias switches so far either.

Not a fan of the backlight, I wish it were more diffuse rather than showing separate LEDs. But I already knew it would look this way from the pics. The colors are nice though.

This is not necessarily a review of KBParadise: this is more a review of Matias switches, and MechanicalKeyboards.com's service.
First, I should say this is my 14th mechanical keyboard. Most were Cherry-MX and their counterparts, a few Topre, a few Nopre, and a whole lot of scissor switches (if that counts).

The Matias/Alps world was my white whale. It was my final mission, to find the perfect switch and perfect typing experience. I myself am a linear man--especially silent linear--and light springs, I love very light springs. I love Gateron Clears, Niz electro-capacitive boards with their 35g rubber dome switches--that's my thing. So naturally, after seeing Chyrosan's review of these switches, how everyone loves Alps, how it was part of the Open Steno project (a crowd-fund campaign to find the perfect switch for stenographers), and that the Matias Quiet Linear had 35g springs--well, naturally this board was made for me.

And it proved to be true. This keyboard is killer. I mean, KBParadise make okay boards--the stabs are fine, the keycaps suck, the flex is fine, the programming sucks, the fact that Matias cannot have LED's but do have RGB underglow, the fact that this is NOT nearly as silent as an HHKB Type-S or even Gateron Silents with O-rings--all of this points to the highs and lows and the vagaries of our complexion toward mechanical keyboards. You win some, you lose some. Therefore I will address one thing and one thing only, my white whale--the Matias Switch itself.

It's not like Cherry MX, that's for sure. Following through on a keypress and bottoming out is weird; in fact it almost feels like it's training you not to bottom out; to just barrel on, barely press, skim along and tip-tap on the keys. The actuation point is DARINGLY high; you barely have to press and it registers. I hated it at first, I am so used to bottoming out and hearing the clack that I had to re-train my brain on how to type. So I turned to the most sophisticated typing program available: The Typing of the Dead.

To be fair, I am not a gamer. I am a novelist, and everything I do related to the matters of prose: to the em dash, to the comma and semi-colon, to ellipses and exclamation points. I do not WASD nor do I fuck with the arrows. I just write, man. And this keyboard is damn near perfect. Let me rephrase that: this SWITCH is damn near perfect. If you want to write for long hours without fatigue, if you want a completely new typing experience that is akin to the minimal travel in the world of Apple keyboards or laptop keyboards, then this is for you. I have the Type-R Polestar version, with Matias Quiet Linear, and for $99 flat and no shipping fees I got it to my house within 3 days. This is the service of MechanicalKeyboards.com, and they are, without a doubt, without even a single inclination of trepidation in my brain, the best keyboard source in America.

There, I said it.