Having been into an Apple store and handled both, in regular 7 size, I must say the MB is very nice!
I was surprised, as I thought going for the new JB was going to be an easy decision. To be honest, I preferred the MB on first sight. The JB was almost plastic looking and the MB had a more premium look. That said when I spent a little longer with it (I was in the store for a while!), I realised that the glossy feel of the JB chassis blends seamlessly into the display glass, for, what I can only describe as an infinity touch (I think I should patent this before Apple gets their hands on that strapline). Anyway, what I mean is when you swipe the screen from left to right or right to left you're finger/thumb glides over the curved screen and slightly into the back case and it feels gorgeous (maybe I'm getting a little too excited about this). When you do the same on the MB you go from warm, smooth, curved glass onto the cold matte aluminium chassis and there is a slight ridge between the two. This for me was one of the selling points of the JB.
Admittedly the JB is a huge grease and fingerprint magnet, particularly the Apple logo on the rear, which seems to attract oil swirls! But that said the MB isn't without it's faults ether. For some reason it is super slippy. I mean more so than any iPhone ever made!!! I was so surprised when i picked it up from the display stand and it pretty much immediately slipped out of my hand (AND I have a strong grip). This obviously won't be an issue if your going to case the phone.
For me though, having gone through the process of thinking about cancelling my order, I've now decided that the plus, in Jet Black will be perfect for me. My intention is to either get a reservation on the IUP or when my pre-order arrives, taking it back to the Apple Store for a refund and resale under the IUP terms. This will mean I will be able to use my iPhone careless. I will probably keep it in a leather phone pouch however. Ive seen a nice one here -
https://www.lucrin.co.uk/leather-ip...3&_bm=&_bn=g&gclid=CPSjsfCsp88CFWgo0wodpHEF7Q
Plus my full skin, should I choose to use it has been shipped from Best Skins Ever -
http://www.bestskinsever.com/iphone-7-plus-skins