I've been using the gorillapod, usually with the 7D and EFS 15-85 combo, for about 6 months. I think it is great. I haven't had a problem when wrapping it around a rail, as pictured. Although, I usually do hold the camera strap. Even though it is insured, I would hate for something to happen.

Where I've run into issues is the bottom feet sliding on rocks. I guess they make spikes, but I don't have those.