Both types of Matias switches are smoother and more tactile than any MX switch. The quiet ones are quieter than any MX switch. The clicky ones are louder than any MX switch. [Though sound of keyswitches depends a lot on keycaps, plate, and case.] The actuation point is quite near the top of the keypress: some people like this, some people don’t. Matias switches are stiffer than MX red, blue, or brown. They’re less stiff than MX black, clear, or green, though clear is somewhat close. (I personally wish they would actuate with about 5-10 grams-force less than they currently require: I slightly prefer the weight of blue or orange Alps, Alps plate spring, or SMK “monterey” blue switches. Matias switches feel very similar to good-condition complicated white Alps.)
From what I understand, the Cherry MX blue “jailhouse” mod results in a switch that’s closer to Matias quiet switches than any other type of MX switch, but my guess is that it’s probably still less tactile.
Matias switches have a bit of “wobble” forward/backward, even more than complicated Alps switches do. I don’t personally find this to be an issue, but some people don’t like it.
For much more, see this thread:
http://geekhack.org/index.php?topic=32769.0
