I ate low-carb for 1.5 years. With that, I used lots of whey protein in water.
I now eat a low-fat, high protein diet that includes quite a few carbs. I had to switch because my cholesterol was through the roof. But, I'm glad for the change. I don't eat 'simple sugars' with the exception of the lactose in skim milk. And now, I am really starting to grow. I hypothesize that the carbs increase my insulin which helps me to grow, but whatever the reason, it is happening.
The milk has caused other problems with gas and whatnot, but I'm trying to put up with those problems and hope they get better.
The only whey that I can still stomach is ON chocolate. I'm still pissed at ON for even offering their sorry-ass "vanilla ice cream" whey (that shit is nasty), but I have to admit that their choc is very good, consistant, etc. I just got another 10 lbs of the stuff in fact. I still drink it with water probably 50% of the time.
There is another whey vendor (which I won't name) that has a good reputation (that they do deserve) and great prices, but I don't think they sweeten their whey enough, although they do use the best artificial sweetner available, IMHO.