i've got a superpro and have found the strap to be excellent. most of the time i don't even use the stabilizer strap and the bag sits fine. everynow and then i might have to hit it back into place but if you used the cross strap all the time this would never be a problem. i have found that it tends to shift more is it is drastically underloaded and something heavy is in the bag (my ulock). so be conscious of the amount of space you plan on needing and don't go too big. really sweet bag in all aspects though.