They did a trial at one of the Uni's on Goretex and the like. With a surface layer of water (i.e. when it was wet from rain etc) they all lost 90%+ of the breathability. Imagine what happens when it is 100% wet - no breathability to my mind. I guess they are using a dry liner of some description within the suit, which might work comfort-wise. One thing I've learnt though is that being wet isn't a problem - being cold and wet is. So, IMHO, a drysuit with a good inner is going to be just as good, and half the price, of anything Gore can come up with.
