Probably not the best
The Good:
Look cool, nice puffy tongue. Grip is decent while it lasts. the sides/leather holds up nicely.
The Bad:
Got these for skateboarding. Minimal padding in sole/footbed area (as usual with osiris). The grip does not last long at all, I can't imagine it'll be too much better for bmx.
Overall Review:
Good looking, but theres definitely better choices as far as bmx shoes (i got the vans half cab pro's they're fantastic)