I couldn't really get it to stick on my dashboard, which is the purpose I bought it for. I was going to return it for a refund, but the return process takes some time/effort (minimal, but not as simple as amazon's returns) so I just am holding on to it. The dashboard of my car is slightly textured (the plasticky rough texture) and I'm thinking that's why it wouldn't stick.
maybe I haven't mastered it yet, but the flex mount tips over easy. I've only tried using it as a stand on a flat surface, so can't speak to how well it holds when wrapping around something
I was hesitant about how well this would work, but I love it and wish I'd gotten it sooner. My phone is very secure with a popsockets brand MagSafe wallet with pop socket on the back.