Got my silver 128 GB 7 Plus. Here are my 7 initial impressions for the 7 Plus.
1) It's friggin' huge! Makes the 5S looks tiny.
2) With my small hands it's basically impossible to use one handed.
3) Home button sucks. I'll get used to it, but it still sucks. The whole bottom of the phone vibrates. Doesn't feel like a button, although at times I can convince myself it's a tolerable replica. Well, not really. It just feels fake regardless of the setting used. This is in stark contrast to the touchpad of the ForceTouch MacBook Pro, which feels great, and absolutely real. It reminds me of the trackpad on the 12" MacBook, which is worse than the MacBook Pro's trackpad, but the 7 Plus' haptic feedback here is noticeably worse than even the MacBook's. My wife doesn't like the new home button either. The first time she tried it she said it doesn't feel right, and I didn't even ask her about it.
4) Silver looks great. Doesn't scream "Look at me!" but is an understated sexay nonetheless. Refined. The antenna lines are so noticeable either.
5) Tempered glass screen protectors for the 6 Plus do NOT properly fit the iPhone 7 Plus. I had ordered a 7 Plus protector off eBay (although I'm not sure if it's just a 6 Plus one), but it hadn't arrived yet. As luck would have it, the convenience store where I had the UPS shipment sent to happened to also sell tempered glass protectors for the 6 Plus, in amongst the cigarette lighters and what not. So I bought one. The dimensions are more or less correct, but the cutout for the earpiece is not wide enough. I assume because in the 7 Plus the earpiece is now a speaker, they made its slit wider, so the cutout for a 6 Plus will cover the ends of that slit - partially obscuring it.
6) Does the camera of the 6s Plus stick out more than the 6s? Cuz the camera of the 7 Plus sticks out more than the 6. I'm using a cheap 6s Plus bumper on my 7 Plus, and it's not deep enough, so even with the bumper on the camera is touching the table.
7) It really is super fast. Any lag I had on my 5S is completely gone. It's perfectly smooth for just about everything.
And Plus: 8) The audio is noticeably better than any iPhone I've ever heard before, and the stereo separation is actually noticeable. But more importantly, as mentioned the quality is just better, and the volume is decent. However, the quality is still not exactly good. Just about any outboard speaker will sound better (except those dollar store wired speakers you buy for $3).
P.S. Mine shipped with 10.0 and is model A1784. Unlocked Canadian model. No CDMA support. I was able to restore my 10.0.1 5S backup to this 10.0 7 Plus.
So it would explain how they got the adapter so thin. Interesting. There had to have been two unused terminals for them to implement analog on a pair of them.
Also I'd agree that the iPhone DAC/Amp is the last place I would look for an upgrade. I say this even while using a cipher cable which does exactly that. The headphones are the most malleable part of the playback chain by far.
Hmm... I just tried the headphone adapter on my 5S. Works fine. Sounds play fine through my completely analogue Etymotic ER-4P headphones. So, is it just hijacking the DAC from the headphone jack then?
BTW, we have our controversy - you can't unlock the phone with a glove on.
http://daringfireball.net/linked/2016/09/16/home-button-requires-skin
Can't use TouchID with gloves on either, and I found that touch sensitive gloves were really hit and miss. So I would usually just take my one glove off. However, I'm usually not outside that long since I drive everywhere. BTW, you can get gloves were you can temporarily remove just the tips, exactly for this purpose.