I like them both I guess. EC2 has more soft clicks, so I am getting used to that. I miss the V1 acceleration though, because the Icemat is small, I had to raise my sens to 2.3 @ 400 dpi where I was at 1.75 before, so i'm getting used to that. EC2 is pretty nice though. I could probably fix my Kinzu if I really wanted to by replacing the cable, no mouse is quite like it and I've used it for so long, transitions are hard. I'll stick with the EC2 for now though, but I might switch back if I can't find the comfort that I had with the v1.