I am not sure what the other reviewers mean by stiff soles. 5.10 shoes tend to be a little soft in general. I own mountain approach shoes and have tried on the heavier downhill shoes. When compared to other manufacturers they are a tad soft in my opion. The BA5IC shoe is quite a bit lighter than the freeride/downhill models. Maybe this is what the other reviewers meant. I could see how the extra cushion of a heavier sole would be an advantage on big stunts.
The sole on the BA5IC is definitely stiffer than the vans bmx shoes I was wearing. I am giving these 4 starts for a bmx or lightweight downhill shoe. I do not take 20 foot drops nor do I do big free ride stunts. I do take smaller drops, like kickers, love to suck up bumps and rail the turns. The shoe works well for me and is a step up from my old vans. I cannot comment on their efficacy on big air big stunt biking.
Hope this helps other buyers. I think they are a great value.