Probably the best bluetooth mouse out there if you have an Intel Mac running 10.5.8 or later.
It might be a little overpriced but I think it is worth the extra 20$ compared to a bluetooth mouse from Logitech for $50 for three reasons:
1) If it breaks and was not clearly misused they will replace it in store.
2) Multi-touch features.
3) Four months of battery life.
I bought one for my first gen unibody Macbook today been using it all afternoon and it is the best experience I have had with an external wireless mouse since I got my Macbook nearly a year ago.
Edit: Reason #1 only applies if it is within the first year following the purchase.
