I'm using a g400. I use the "ridge" and inward curve of the right side for my grip. The right side of the ec1-a and ec2-a seem to curve outward like the zowie AM or deathadder. The zowie AM hurt my hand because the side curve forced my ring and pinkie finger into an awkward position. I couldn't pick up the deathadder to adjust its position because my ring and pinkie fingers slipped on the side.

Can anyone who's tried these mice comment on this?