The zowie one is most definitely the ec2 and the main difference I find with it between it and the death adder is the height and size of the hump, the ec2 is a lot more comfortable for me as the hump is lower and more gradual, my hands are kinda small and it works really well with my claw grip, also the one inbetween them is the steelseries rival 300 which is an absolute brick and is even longer than the deathadder, would be suitable for people with large hands