I've had my S6 Edge Plus for a few months now and the first case I got for it was the Otterbox Symmetry case which I like but find the buttons a little stiff and difficult to press. Not terrible but bad enough for me to have tried out many other cases since including: the Urban Armor Gear (UAG) clear case, a clear misty colored Incipio, a couple cheap cases I picked up for 15 bucks each at the mall one day, one was called motomo I believe and the other has no branding at all. Anyway, my latest case I'm trying out I got today. It's the official Samsung S-View Flip Cover in Blue-Black to match the phone but they also had it in Gray...
Got it from Best Buy for $50. I think it was on sale or clearance or something cause I could swear it was $60 or so last weak.... it's pretty cool IMO. Has features such as volume buttons when closed, see through cover which I think has touch support for a few functions like answering or rejecting calls and notifications (though I haven't had a chance to test that out yet) and seems to provide some protection especially for the screen when closed. Plus, it has auto sleep/wake functionality... It also seems like it will be easy to.get on and off.
One downside to the S-View Flip Cover is it is a fingerprint magnet. But I've found that a quick wipe with.an antistatic rag or on any soft cloth gets the fingerprints off of it instantly. I guess if I had to rate the cases I own I would say the Urban Armor Gear is my favorite and the S-View is my second favorite. The Otterbox is pretty good too.