My '10 FE450 hasn't noticeably used any oil in its 45 hours. You do sometimes see a tiny bit in the airbox when the engine's been hot and it's come through the breather pipe, but it's not enough to make any difference to the level in the window (especially bearing in mind you're replacing the oil at least every 15 hours anyway).
What sort of problems are being reported on TT? I can't recall seeing anything significant here which I'd expect to if there was a real issue with oil loss. In fact the main complaint we see on here is that there's not enough going wrong with the new bikes to generate forum traffic!
I know we're all likely to be biased here, but the current 390/450/570 really are phenomenally good; I only wish I'd bought one sooner and I honestly can't think of any other bike I'd even consider buying now. Much more agile than you'd expect for the class and as sweet an engine as you could hope for - nice and gentle when you want that or give it some serious throttle and it becomes an animal, even from low revs. Smooth too, so it's not unpleasant on the road if you need that (apart from the seat, but you can't have everything!). The only real question is which model best suits the riding you do...
