I love single speeds, I had loads. Of all the bikes I've ever owned, including hardtails, geared and full sussers , the On-one 29er was the BEST riding and worst made bike of all. I had a refund after 4 weeks. Beautiful ride ( especially for tall people ). Rolled over terrain like a German armoured division. Like a Bontrager to MY scale.
Sh*t welding, poor R+D on the V brakes, no quality control on the " bag-o-bits " to assemble the sliding drop-outs ( every part either missing, unfinished or broken after 3 rides ) and it NEVER EVER, even with my strength on the allan keys, was able to maintain chain tension.