First up: This is my first Keyboard with Matias Quiet Click Switches. I do own several high quality boards with Cherry switches though and I will try to compare both the switches and the board itself.
Things I didn't like first, so we got that out of the way:
The big stabilized keys rattle pretty hard. It's kind of annoying and I havn't had that issue with comparable Cherry-MX Boards like the Vortex Pok3r. It makes typing louder than necessary, wich is a shame, cause the switches itself are at least as silent as Cherry Browns with additional damping rings installed. However I was able to fix that with some lubing (try thick products) and now the big keys sound very pleasent.
I also noticed some very minor pinging, but I think most people wouldn't.
The keycaps sit very stiff on the switches. In fact so stiff, that I had to use quite a bit of force to remove them. And that is with a wired keypuller. My guess is, that you will have a very hard time trying to pull them of with the included plastic puller. There is also some danger to damage the switches. Keep that in mind if you can get your hands on some aftermarket keycaps.
Now the good stuff:
Switches (Matias Quiet Click) feel very pleasent. They are quite tactile with a tactile bump right at the beginning. After the bump the key falls into buttom-out with reduced force needed. For comparison: Cherry Switches get stiffer after their bump till buttom-out. The bump with Matias is much sharper and more pronounced than a Cherry Brown and may be comparable with Cherry Clear. They do feel much lighter however and your fingers don't fatique, cause you only need to overcome the initial bump and don't get much resistance after that. They also are smoother than Cherry switches. I can type with these as accurate and fast as with Cherry Blue, but without the annoying high pitched click. I consider them superior to Cherry tactile switches.
Buttom-Out is not as hard as with Cherrys without being mushy.
Keycaps aren't that bad. Many keycaps are, if you're not looking into after market. Texture is ok and lettering not really feelable. It's no GMK-Set though. Keep in mind that I can only describe my experience with the vintage set, as dark lettering on bright caps usually makes less problems than the other way round. I expect the legends not to fade away. With dark keys you most likely get a white infill for the legends, that gets dirty and feels scratchy.
The keys do wobble a little bit more to the sides than Cherrys. Doesn't bother me or affect my writing though.
The keyboard case is not the nicest thing in the world (it's plastic, over all) but it does its job. Doesn't crack or bend or squeake or anything. You can always install a after market case with decent materials if you wish. Nothing to complain really, wich is seldom with keyboards.
Over all I'm pretty happy with the board. Writing is pleasent and efficiant and there aren't many things that bother me. Lubing the stabilizers however is a must do!
Pricing is a little bit on the high side imo. You will get a Pok3r with same layout, Cherry switches, a metal case and superior PBT keycaps for not that much more money. If I had the choice, I would still pick the KBP v60 with Matias Quiet Click, cause the switch and therefore the writing experience is that much better.