Are you aware of the creep on the 15-85 though? Ours has started to get pretty bad after a year from new, but a chunk of that's been with the lens hanging downwards from the body on a strap, so possibly not the best care regime.
I've had mine for about a year (I carry mine around as an all-purposes lens, FWIW) and no lens creep, with a small caveat: if the lens is pointed down and between 15-28mm or between 50-85mm then no creep whatsoever--go ahead and run with it. But if you leave it in the in between area of 30-45mm or so, it will start to creep a bit. But not as bad as my old 18-135mm and not an issue for me since I keep it at 15mm when not actively shooting.
(I believe this was noted in some review I read a while back, and this proved true in my case).