i got 2 copperheads from woot for like 20 or 25 bucks… i love them..
also had the G5, which also kicks *edited*. though it feels way different than the copperhead.
copper head is a finger (thumb and ring) type holding mouse and the g5 is more of a palm mouse. same with the mx512
all are good, if you liked the copperhead why not just get another they are cheap