Despite slagging it off slightly in the past, I saw one for £40, so bought it! Seemed like a good price (second hand) and that way it's actually significantly cheaper than the air coolers it trades blows with. Thought I'd give it a try.
On my Q6600, temps were not impressive, even using push pull. It hit 80 deg using IBT at 3.4GHz, so something wasn't right. Tried remounting it twice, but it still didn't perform up to my expectations. It may be because it was a low VID chip where the voltage had been increased somewhat for a rock solid clock, I sold it now so I'll never know anyway. I then moved to a Phenom II 965 BE, and the temperatures (despite the higher TDP) are much better at 60 max on IBT at 3.8GHz. Case is an Antec P182SE, so not particularly high airflow. I think part of the increase in temps was due to me spending about 30 mins really thoroughly cleaning the surface of the cooler with IPA. Stuff was still coming onto the cloth after around 25 mins of buffing it, so I guess there was a lot of TIM from not just me, but the previous owners (two of them!) still in the small valleys in the cooler. It must be noted that it doesn't have a perfectly flat contact area, so this may be a problem for other people if they're not getting great temps due to the tiny micro-valleys in the copper. Lapping may therefore yield improvements, if not certainly making it easier to clean.
Overall, it now performs as I expected, and was a good investment for £40 I reckon. I wouldn't pay any more than that for it though, as I actually prefer the mounting of my old cooler more (Noctua NH-U12F), and it's a lot less fuss than to worry about fitting a rad and push pull fans, not that it's difficult, but less convenient. There was also a potential issue of less air getting to the motherboard, particularly the CPU power phases, but this seems under control at the moment. It does look better in the case, that's for sure, and now I can worry less about transporting my PC in the car (happens around twice a year atm) as there's less weight hanging off the mainboard.