I ordered a pair of the On One Geoff bars a couple of months ago. They just arrived and are looking pretty sweet! Never owned any OG Jones bars (way too expensive given I get out on my MTB a couple of times a year thanks to kids) so I can't compare directly but they look very similar to pictures I've seen of Jones bars.
There's no weight quoted on the On One site and I wondered if that would be why these are so cheap. But mine come in at 550g, so pretty much the same as the more expensive Jones bar.
I'm all for protecting innovation, but I can't understand why the Jones bar is so much more expensive than these. If his were £50ish then I'd have gone with the original, but £25 for the On One vs £155 for the Jones made this an easy decision.