Im a fan of the pro alloy gear but i had a few problems, my first one started leaking, then i sent it back to be fixed, which they did pronto, no quibbles.

Then it burst again, sent it back and they had it right through december and then sent me back a brand new rad AND cooler, agan...no quibbles they found it was a design problem in the S1 kit where the cooler rubs on the radiator and eventually punche a hole in it, i got my brand spanking new cooler & rad modified o no more rubbing, albiet with rubber strips round the cooler.

Now its a bit of a bastard that the rad broke twice however i cant fault them on customer service and the equipment does the job well and on that i would say go Pro Alloy