I haven't used a screen protector since my Droid X days (also had a Razr Maxx) and even then I took it off after awhile and I've never had any scratches on any of my screens. I just pocket mine in my front pants pocket and never put anything else in that pocket at the same time. I like the feel of the screen better without one.
As far as cases, I'm kind of torn as I do kind of think you should show off your Motomaker design, but although the ergonomics of the phone feel great in hand, I find it slightly on the small side and feel I'm less likely to drop it if I have a case on it. So....like others, I like to go naked without a case at home. And when I'm out, I alternate between an Incipio Dual Pro case for moderate protection and a Trident Aegis case for heavier duty protection (has port covers and more cushioning for times like when I'm out on the golf course using my golf GPS app).