I have this mouse as well. At first I thought it was chewing through batteries, but occasionally it will stop communicating with the PB (like once every 5 days). The first time that happened I thought the batteries were toast, so I replaced them. Afterwards, I just hit the reset button on the bottom... and good as new. (haven't changed the batteries since, been about a week of solid use).
That said, the mouse responds especially well on 'other' surfaces (couch, bed, floor, shirt, pants, etc). Sometimes when I get an odd angle by the PB, it gets a bit sticky... not really sure what exact proximity causes it... seems like directly to the right hand side of the PB, less than a foot in... and its sporatic.
The build quality is good, and I'm really glad I bought this. It feels too light without batteries in it, but with the two double a's, it feels spot on. The scroll wheel has no 'clicking' feedback, its smooth... something I prefer, though others don't like.
Anyway, I'd recommend it. It looks just like the apple mouse, and is about the closest to the Alu color as you can get.