I have several two-piece Spigen Neo hybrid cases. I change cases often to switch colors. They are very tight and a bit difficult to get on the phone the first couple times you put them on, but loosen up after that. In my experience, they stay in place well and never become too loose. However, one of mine broke near the Lighting port opening after a couple months of usage. I read about others having the same problem. Spigen redesigned the opening to make it a little stronger at that vulnerable spot and I haven't had a problem with any of my newer ones breaking. Overall, they hold up well and provide quite a bit of protection (as far as bumper cases go) due to the rubber inner lining.