Well I got the MX Revolution mouse a couple weeks ago and when i used the one search function it would bring 2 tabs up in monzila, so I contacted Logitech and explained my problem and they asked me for proff of purchase and all that stuff and they sent me a new 4.0 version (had the 3.01). In the email it said it would take 10~14 days but I go it in 2 days.Well im very happy today.
So I would recommend getting a Logitech products in the future, I am very happy with the service I got.
http://www.logitech.com/index.cfm/mice_pointers/mice/devices/130&cl=us,en