Well I managed to reserve a 256GB matte black 7+ in Gateshead on Friday and picked it up straight away. I've never used an iPhone before, but moving from a pretty battered Nexus 6, it's amazing. Apple Pay is really convenient, and seems to work much quicker than using a bank card, never mind having to fish one out of my wallet. The apps all seem better quality than their Android equivalents and the battery life is amazing. I haven't charged the phone since Sunday morning. I've still got 25% battery left and I had a full day's use out of it yesterday including plenty of Spotify and a couple of hours of videos on Youtube. I've never owned an Android phone that wasn't completely dead within 24 hours if used heavily. The camera is excellent too, but more importantly for me the phone is ready to take a photo much quicker than my old Nexus which took an age. Touch ID is crazy too, it works instantly. No lag whatsoever which I was shocked by.
Not heard the coil whine. I'm not going to go looking for it either as presumably once you've heard it you can't unhear it and I don't want to torture myself.