Ripster has an audio clip of the KB-5181
here.
I actually prefer the sound of them to Cherry Blues; not nearly as loud as a BS, but it's pretty solid. However, maybe I'm just used to Cherry Blues or Topres, but the keys feel noticeably stiffer. Not a big problem, but if you don't hit the key squarely, it'll bind up. Also, the switches aren't very consistent from key to key (this is NOS from 5k177). Some keys actuate after the tactile bump and some before; also, some feel a lot stiffer than the others. I haven't done anything with them, i.e. greased the stems, since I got the keyboard. Overall, though, it feels very nice, and you may not have the same problems I've had. It's just not as consistent as the other two boards I use on a daily basis. I still bust it out whenever I'm feeling like a badass.
Another thing to note is that the plastic enclosure is pretty flimsy. Not a big deal, but it does bend and creak pretty easily, so be careful with it.