I don't own one, but spent a bit of time on one. Weight was a little high because of the poor spec, and a fair bit of it's in the wheels/tyres so it feels heavy- takes an effort to get up to speed. Felt like it had the wheelset off a £750 Halfords bike tbh.
Tyre clearance is not great, the rear end is pretty flexy too which means it needs more spare space than most. The one I rode had a 2.2 rubber queen in it and the tyre was pushing into the frame in corners (and that despite the tyres being pish, I never was able to ride it particularily hard). Better wheels would improve that but the swingarm's not the stiffest either (much as you'd expect)
But I liked it. The full build was not good enough in places but if you could get a frame for a sensible price, or some sort of custom build with suitable wheels and tyres, I reckon you could make something very nice indeed. A very un-29ery, very Fivey 29er.
OTOH when even MBR have to find fault with an Orange, something's gone wrong!