Well just fitted my H70, and honestly, not that impressed.
Upgraded from a H50-1, was hoping for about a 8-10C difference in max load temps.
I'm getting 2C different.
57C Vs 59C, using same fans (2 x Apache).
Also the H70 was a pig to fit Vs the 50. The pipes are shorter, and just as hard to bend. Also as the Rad is fatter the pipes have to do a tighter loop as the rad is closer to the socket. The combination of those elements make it a real pain to fit.
There was a ton of air bubbles in the H70 as well, just tilting the rad I could hear the liquid sloshing about, and upon turning the rig on there was a ton of bubbles pushed through the system.
I'll give it a couple of days to settle down, see if temps improve.
So far I'm thinking £40 wasted (sold my H50 for £45).