Summary: I use this at work 8-14 hours every single day. I have to replace the 2 AAA batteries about every quarter, which doesn't seem like too much for me. I think it looks fantastic, and just about every month I give it a good cleaning.
Pros: Looks great, low price, works fine, decent battery life, satisfying click (I realize this is quite objective).
Cons: Fine control takes a little getting used to. For the first month it was so different to me that I almost stopped using it.
Summary: I have the black one. Within a week of ownership, one of the keys popped off from taking it in and out of its neoprene case, and I can't find it anywhere. I like the size because I use it mostly for keyboard shortcuts, and it helps that I have small hands.