Up to this one, I had been using mostly no-name mice but I got tired of fighting the cable. I had had a cheap cordless one but the rechargeable batteries wouldn't last more than a couple days.

I got the Logitech one model before the dark field laser because the battery life was excellent, it did everything I needed and I figured the thing would last. I guess 2 out of 3 is the best to hope for :-/