Mine has been fine, Tested it for 2 hours upon receiving it and been in my PC ever since. Not one problem with it at all. I have also noticed a few people saying Corsair upgraded them to a new h100i after such incidents happening.
Having dealt with Corsair before I would say they are worth it. Corsair will make it right.
We don't need to go to Corsair are warranty is with ocuk and if you did go to Corsair directly you would end up paying a fair bit to just ship it to them.
I don't want to play devils advocate but really we are covered up to 6 years and for something like this I don't see it being an issue after 3-12 months they cant refuse it due it would be classed as unfit for purpose.