I use Sunlites on my hybrid commuter- short wheelbase. no real problem with the heal strike and I'm a big guy. The one thing I didn't like about them was having a pair of separate panniers versus a pair that's joined with a piece of fabric between; I think those would stay on better. As it is, I attached an aluminum rod near the top and bungee the rod to my rack and they are very secure that way (although it takes a few extra seconds to remove them). Durability has been okay after 2+ years of semi-daily commuting; I had one seam let go (for the drawstring at the top of one of the panniers; the snap-close cover still keeps everythingin place).