So I've installed the GM early on my 4 and thought I'd sum up my experience now that all my apps are installed. So far it's a bit stuttery here and there. Especially when pulling down the notifications bar. Otherwise it's a pretty good experience overall considering the age of the phone. Update as of 12/9 the phone has smoothed out in most places, but given the age of the device, I'm not bothered by some minor stutter and lag. Here's a small gallery of screenshots I've taken: http://imgur.com/a/rQTlI Any Q's or requests, fire away! -Tapping on a Folder, there is a notable, but small pause before the folder opens. - Viewing photos in the Photos app is extremely quick. Tap to view a photo and to go back is quick! 19/09 update I decided to try a restore and setting up as a new phone now that it's been released to the public. Performance has marginally improved to a point where I really do think I could last another year on this phone.