I have the basic clear ESR Zero (flexible TPU; no magsafe ring). It fits well, gives good protection, and was very cheap. I don't like that it has a blue-ish tinge (something to do with the anti-yellowing, I'm guessing) and makes my white Pro look very cold/silvery, but that wouldn't be an issue depending on colour & individual preferences. It does show marks on the back but they wipe off easily. Also the popsocket adhesive sticks so well I don't think I could get it off if I tried! (The traditional sticky kind, not magnetic.)