I"m not happy with the "5's" the rachets point down. My boy's board, snow packs under the rachet and it tightens up. Mostly just the front rachet's. This is very annouying. I had to resort to zip tie's to strap the rachets down. This is not a good design in my opinion.
My other boy has the M 9's and we have had NO issues at all. I have the NXT ASE and love them. I have absolutely no strap pain. The power strap fits looser than conventional straps and if you have it to tight, yes, it's hard to get your foot into the binding. Once you learn to set these your in/out in no time.
As for park or freestyle, jibbing etc??? I don't have enough experience to say if they are soft, hard, to flexible etc. For my ability and speed I love them. My kids and I ride together, so once we are off the lift we are riding away
Hope this helps, and just my thoughts.