Another glaring problem
...is that, for the Two, OnePlus has produced regional versions. I was looking forward to the dual SIM facility, meaning I could roam in the States on a local SIM and keep my UK SIM in too.
Two SIMs, one phone: what's not to like? Well, the fact that the European version doesn't have any US LTE bands, for instance. The One did. So, yes, I could roam in the States, but I get 3G at best on a European Two. And that ain't good enough for me, because I _need_ the speed: hotel networking there often is wired-only (I mean, seriously? Twenty-FIRST century, anyone?), and when it's actually wi-fi, it's either larcenously expensive - $15-20/day is typical) - slow, or, quite often, both.
The lack of NFC's a problem for me too, particularly as I was writing an Android NFC app for one client!
So, the Two's a zero for me. Sorry.