I went with this meaty case despite never having put a case on a phone before. It really improved the feel for me, and I no longer fear dropping the N6. I ripped the screen protector out of it immediately, though.
It really doesn't add as much bulk as you'd think, but I can certainly understand if anyone found it to be too much.
Case works, put it on all phones, N6p, 5x, 6. You can drop this off your roof and it will be fine. My 2 year-old niece is constantly throwing my phone on the ground and it's still like new. It's the Luke Cage of cases.