I purchased the frē version first but disliked the moire rainbow pattern left on the screen with the built-in screen cover. I bought the nüüd version of the Lifeproof case and LOVE it! The nüüd allows the screen to be used and comes with a screen protector that works well (have to use the Lifeproof brand screen protectors to fit inside the case opening).
The nüüd is lower profile than the fre version and overall I am very satisfied with the nüüd version.
I have yet to dare to test the waterproof-ness by submerging, but I can tell you I used my phone in pouring rain and the phone was soaked and no moisture inside the case. Doesn't seem to interfere with sound or the mic.
Only a few things I dislike; the home button on the nüüd case is hard to press (fre version works much better), the case is cut for the two lower soft-touch buttons (menu & back buttons) on either side of the home screen, but it's sometimes hard to get them to react to touch because of the case (Same goes for some stuff close to the very top of the screen), also wish the headphones jack plug was a screw-in type, since the rubber plug doesn't look very secure over time.
Overall very satisfied with the nüüd case.