I buttmounted my canister for years because that's what I was taught when I learned sm. I thought that the can on my hip would be annoying with the sm tanks, so I never even tried. I moved to a bm ccr with sm'd bailout and decided to give hip mounting a try. I liked it so much that I now do it for any sm diving. It doesn't get in the way of the tanks at all. The only annoyance is if I dive al80s I don't hip mount because I need 2 d-rings or a sliding dring to move the tanks as they get light. For me, the cord routing is easier. I also like to tuck excess cord into my waistband when the light is stowed which you can't really do when it's buttmounted.