Mine (c456) suffered from really poor finish. They aren’t compatible with helicopter tape and apparently the adhesive attacks the finish and damages it (though I notice they still don’t warn buyers about that) That, and On One’s dishonesty afterwards, really soured me.
But to be fair as a bike, it was decent- it rode well, not a huge fan of the geometry but the frame feel was good, reminded me a lot of my Soul which is a very good thing. Had a lot of fun on it. So I think I got what I paid for at £300, you can’t really expect quality and good service at that price.
(If they’d just put a bloomin warning about the tape on the website I’d have avoided the problem and been a lot happier. But I learned a lot about the company as a result and won’t shop there again)