I have one too. It's a great idea. But, sometimes I just want to hang it on one shoulder, like you might do with a regular backpack, without looping it over my head. It's not really made to that, and it slips off my shoulder easily. I find "slinging" the thing around from your back to your belly to pull stuff out is great...except when you are wearing a heavy coat...sometimes the "slinging" action twists your shirt around too, which is annoying (nitpicking, I know).
...some things to think about....
It's a great bag, made very well, but IMHO...not perfect.
$50 is great price, btw. I think I paid $69 at Costco months back.
--Michael