Noone down here is using a 70 yet that I know of. The os 46 is a good combo for sports flying, the os50 is much stronger, it seems like a good combo for pattern style stuff but I still wouldnt do any low down hovering just in case. The best setup ive seen is a YS 63. I'd trust the plane completely right down to the ground with this setup (but it is sustantially more expensive to buy and run). I think the os 70 would give the same sort of performance as the ys 63 so you should be very happy with the plane. I'm having too much fun with the small electric 3D planes to get a FR right now but I really do love flying everyone elses.

Matt