received mine today, a week 28 manufacture, i can not replicate the antenna attenuation, i tried it at a few spots around town and it did not go down, no rattling, no green blob that I can tell yet, no screen discoloration, sim tray so secure it was actually difficult to remove the first couple of times.. have NOT tested proximity sensor yet but I will let you know when I do..
a couple side notes: if you did an upgrade swap normall you call then plug into itunes, don't do it with this model, plug into itunes activate for the other # then call afterwards, otherwise you will not be able to activate the phone and will have to go get a new sim because it will register it as already activated and the phone will not unbrick..
also when I went to put my screen protector on I almost crapped my pants cause I thought i cracked it while trying to push out air bubbles.. ithought man, tha really IS weak.. i was about to call when i thought I would peel it up and realized it was an actually an eyelash had fallen behind it when i put it on, lol, just thought that was funny..
anyway, i'll let you know on the proximity sensor when i test it in a mirror, but otherwise so far so good