Hello, I myself got an abyssus not long ago. I was using a generic logitec mouse before. Abyssus is nice (I got the standard version, not the mirrored finish), very nice feel to the touch, a little smaller than my previous mouse but I think I adjusted within a matter of half hour. The sensitivity is a bit different too, but I think I get that feeling because old mouse wasn't as precise and abyssus feel a little slower now, but if you crank up the dpi, the thing flies.
I haven't used it very long, but first impression wise, it's a nice mouse and I like it. Oh and as a reference I think I use claw grip (my grip doesn't exactly match the description of claw grip that I've read).