I have the Reflex case for iPhone 4 and have been very happy with it. When I moved to an iPhone 5, I didn't even consider any other cases, I knew I wanted to start with the Reflex.
When I received the Reflex case for iPhone 5, I was disappointed. It fits very loosely on the phone and the top and bottom sections of the case do not really lock together like they do on the iPhone 4 version. Sometimes, the case comes apart just from me taking the phone out of my pocket.
The volume buttons are very hard to press through this case and the ring/silent switch is also hard to operate with this case on.
The top and bottom of this case flex a lot. this hasn't caused any problem yet but it feels cheap and has me concerned that this case won't hold up to normal use.