I just got the Deltas. They are pretty good, nice cushioning and flexible. However, I would probably get the Betas if I had it to do over again. The 'handle' part of the rachets are different between the two. They are larger and stick out more on the Deltas. I broke the front foot toe handle off about half way down on my first time out on them. Still useable but a pain in the butt. Also, the Betas have a cushioning pad to cover the mounting plate.