I bought a ProClip mount for my phone (Galaxy S II) and was unimpressed to find that it lightly clipped into the dash of my car, but was mostly held on with adhesive tape. On hot days, the tape basically melts and the mount stays lightly clipped in, but sags and moves around. Not the "perfect sturdy mounting solution" that was advertised.
I emailed support and their answer to me (paraphrased) was "well we've sold a hundred of these without issue, so we can't do anything for you".
Oh great, I feel like a moron for spending $85 on a phone mount. So, word of warning, depending on what car you drive and what type of mount you order, it might sag under the weight of the Nexus 7.
HTC One, unlocked/rooted, S-OFF, no "tampered", stock kernel/ROM