I have two of those kicking around the house, but have not had good luck with them, they are not sturdy enough to be useful.
Ok, I can confirm. I tried a Joby Gorillapod SLR+ZOOM and it proved a bit too soft with a 550D+24-70 L. The 55D is a low weight body, but the 24-70L is a heavier L series lens. The Gorillapod SLR-ZOOM, then, would definitely be too soft with a 7D body or above. It holds ok instead with 550D+15-85 Canon lens, a lighter lens from Canon.
I am going to return it for the stornger Gorillapod Focus.
It is indeed very versatile.