Well, just to add to this H100 thing, mines is fine and I hope it stays that way, I called corsair a couple of days ago because of these scare storisnd also to chance my luck to see if they would send me a new pump with returning the one I have, but it was no go, lol, was worth a try though, they wanted me to return the one I have and I just told them to forget it, plus they wanted a holding fee too which would then be returned to me when they got my broken pump (cough cough splutter, hhahahahah, lol).
Anyway, I asked them about the pump storys as I had heard these stories for a while and they said that going by the amount of these H100's they sell worldwide everyday there is only a very tiny amount of these pump problems, which I would say is probably right when You think of it that way, but of course they would say that anyway, they aint gonna say they never get any faults as we know they do, but how many is a lot, 1 in 100, 1 in 1000 etc etc etc, think about it, theres no way they would still be selling them now if there was loads n loads all the time faulty.
There has never been a change in design and there wont be according to corsair too, but if you dont believe me, call them and ask them yourselves
(without*)