I've owned five of these. Out of those, three or more had creep with the lens hood attached, and two of them had creep without an attached lens hood. My current sample has creep with or without an attached lens hood.
Bummer - guess I got lucky. Mine has the hood and a UV filter.
But really, how bad can it be? For comparison, ever shot with the 70-300 DO
? I had one for a while, now that's a lens with serious creep in its double-extension design. I was shooting fully extended once, tracking a bird in flight, and as the bird flew overhead, the zoom slammed back in so hard I swear I'm lucky the eyecup on my 7D didn't give me a black eye...