I have had this mousemat for a while now and its still great. I used to have an old dell mouse (Dell are rubbish dont buy Dell btw). Anyway, when this mat was new it had a great grip and traction on the track ball in the dell mouse. The many dimpled surface has worn a bit but it still grips the track ball as well as it ever did.
I upgraded to a laser mouse about a year ago, as that works perfectly as well, no problems whatsoever. I cant really comment on optical mice, but from my experience most of them felt cheap and jumped to the end of the screen a lot from subtle movements anyway.
As for the wristrest itselt, its amazingly squidgey, you'll be poking fun at it for ages, though this was my first gel rest. Something that is annoying is that others who sit at your desk will try to pop it open so the gel oozes out, this hasnt happed though despite great efforts from various people. The rest is on the firm side and of course plastic coated rather than the softer fabric coated belkin gel rests.
Another fantasic thing about it is that the underside of the mat is made from sticky squidgey rubber that will adhere to any flat surface, so it wont move about while your using it. This can lead to the eventualy build up of dust and debris on the underside, but you can rinse it off... its all plastic.
For me its great, makes my pc seem 100 pounds more expensive due to its professional look. Be warned however, if you need a large mat or use your mouse in large turning circle movements this will not suffice, and it will not replace a gaming mat, which arent comfortable at all but ensure you wont run the mouse off the mat easily. But im a gamer dabbling in the old Oblivion and UT3 goodness and i have not a problem with it...BUY IT.