My complaint is the weight of the OB4 system. I purchased the double boot setup last year after a summer ending back injury on Stradas. I had several bad OTF falls early this summer and the release worked flawlessly but it felt like I had dumbbells on the end of my feet as I was cart-wheeling across the lake. Can't fully contribute my 2 swollen, twisted knees to the bindings, but they didn't help. I have sz 12 OB4s, so it doesn't look like I can switch to the MOB G10 plates. My search continues.