Some people think that the way the carbon looks is a sign of bad finish. Actually, it’s just a sign that it’s carbon! On One’s factory don’t put a cosmetic top layer on the carbon like many do, so what you’re seeing is structure- it’s lighter and cheaper. Any carbon piece with a really regular “chessboard” finish, which is what a lot of people think carbon should look like, has basically been wallpapered.
That said, the laquer isn’t the toughest, could be better.
There’s no concern about nonfitting headsets. What there is, is problems with some tapered steerer forks. IIRC that’s only on the small, and only on Rockshox? But since tapered is just another stupid failure of a standard and most people use standard steerer (that’s why it’s called standard) it’s not that big an issue.
All in all, it’s a stunning frame for the money. Bit ugly, sure, but it’s tough, fast, light, handles well- all that tried and tested On One geometry finally made out of something other than gas-pipes. Course, that doesn’t mean everyone will like it, but objectively it’s really impossible to argue with.
Subjectively, I’m enjoying mine very much- built light but tough with a 120-150mm uturn revelation, 2.3 tyres, gravity dropper and wide carbon bars, it weighs in under 25lbs yet I’d ride it anywhere. (OK, when I take it to fort william it’s getting bigger wheels and tougher tyres!)