YesI've had mine for a couple of years. It does creep when I'm walking around, and I wish it wouldn't -- but that's not a practical issue. What is annoying, however, is when I'm doing long-exposure tripod work with the camera pointed sharply downward; then it extends to 105mm, often mid-exposure, so that I get a lovely, but perfectly useless, zoom-blur. This is actually a pretty common occurrence for me, since I'm using the lens as an all-purpose tool in the technical documentation side of my work. I guess I could use the 17-40, but the 24-105 is my 'walking around' lens, and I try to minimise the number of lens changes I do.
This lens has actually visited Canon for service under warranty -- it wasn't focusing at infinity, and I was convinced that it could be sharper. When it came back, it was, but the light zoom was unchanged. I very much prefer L lenses with internal zooming, like my 17-40 and 70-200 2.8 IS, but I suppose one can't have everything.
