Its funny, I saw this thread and was gonna bypass it because it didn't apply to me. But of course its full of matte black buyers who it doesn't apply to once again shouting from the rooftops how thrilled they are they didn't get jet black. LMAO.
So since this is a free for all, I have a JB 7+. Its the most beautiful phone I've ever seen. I love it. No regrets.
I am happy with my choice with the 7 JB. Looks much better than the boring matte black. I have no case and it looks great. Great grip too. It really is not a fingerprint magnet like people think. The screen itself is more of a fingerprint magnet than the back, because glass will show it more. My Samsung S7 Edge is more of a fingerprint magnet than my 7 JB.
I've never regretted, I did spend the first week or so going back and forth about whether I wanted to change to the matte black. Once I settled on the Jet Black I've not had any regrets, in my opinion it looks and feels a lot nicer and its still looking as good as new, with no case used.
I have both and prefer the Jet Black. I like how it feels cold in the hand as if it was steel rather than aluminum. The finish is more like bluing rather than paint and looks much more premium than the matte Black.