A Be Quiet Dark Rock Advanced is £20 cheaper, quieter and cooler. The Pro is even cooler, still £5 less.
The Prolimatech Megahalems, Thermalright Archon and Venemous X Black are £12, £15 and £14 cheaper respectively, add on the cost of a decent fan and they're still cheaper and perform better.
Thermalright Venomous X is £15 cheaper, quieter and better.
Thermalright MUX-120 is £15 cheaper, quieter and better.
Thermalright Silver Arrow is £9 cheaper, better and quieter.
So, there are quite a few options, I find it very difficult to find a reason to recommend closed loop liquid coolers to be honest.