Absolutely love it. Easily the best phone I've had, and the price is excellent for what you get (mine was $440 for the 64GB one brand new). The dash charging is a huge perk. I never need to charge it overnight, just plug it up for a half hour while I'm getting ready for work in the morning and it's already got a day's charge on it. And a fully charged battery lasts about a day and a half of regular use.
The only things I don't like about it is how easily it slides out of my hand and how hard & rectangular the corners are, but I'm thinking of getting a dbrand skin or a thicker case to help with that. I originally got one of the official OnePlus cases since I loved the design, but it turned out to be a lot flimsier than I expected, and doesn't help much with the grip.
Everything about the phone itself screams high quality though, from the physical build quality, to the snappy Android software, to the camera. It really does feel like a flagship phone, and I'm not even a little bit disappointed with it so far.