Well, small update.
I ordered the today only 6950 and it arrived today. First impressions? Not great.
Rather than the stock vapour chamber cooler of all the other 6950/70s it has a heatpipe and dual fan job. Great in theory but it just felt flimsy, even compared to my 3 year old 8800gt with an artic cooling twin fan heatsink. When I got it installed I was shocked at how loud it was, even dropped to ~20% it's audible over everything else in my case.
Looks/sound aside the main point of a decent GPU is lovely smooth gameplay. So far I've had a quick run on Crysis and Metro. Both showed decent frames per second but actual gameplay was noticeably choppy, not a good start really.
At the request of a friend over steam I've installed an run Heaven benchmark. Extreme tesselation still seems to cripple ATI cards (a different discussion for a different thread - I don't want to start any of the usual BS) but I also noticed that some textures were popping in and out of focus and some bits of scenery were clipping out altogether. Is this normal for Heaven or a fault at my end?
So in short, I'm not too impressed so far, very tempted to send it back under DSR if this trend continues when I have more of a play over the next day or two. I've yet to try and unlock it to a 6970, it needs to win me round to the idea of keeping it before I bother investing any time or effort in it.
RIP GTX 295.