I disagree with that verdict in terms of AMD - looks to me as though the GTX 560 would be a preferable buy to the 6950...on the other hand, the 6950 does unlock to 6970 which I suppose means maybe AMD is the winner. Bit-Techs review is also worth reading. However I agree on the GTX 560 not overwhelming me. It is a nice card, but ultimately the decision is still favouring a GTX 460 for me personally.
The GTX 460 consistently OC's to increase its performance to the GTX 560 lvl (approx. 25% performance ncrease). At £199 the GTX 560 is costing £75 more for basically whatever its OC performance offers. So the question I ask myself is: is £75 for a 16% OC over what I have worth it? For some the answer may be yes, but for me its an 'I don't think so'
Having fully read the Tom's Hardware review I see why the AMD cards are looking to be preferable. Particularly the 5870 which is a good price these days