I did the testing on the new Red Suit that is now available for 2010. It is very comfortable and much ligher than the previous model. It comes down to how warm you want to be, the Black Suit is heavier but very, very warm. The Red Suit is lighter and more comfortable, both will keep you warm. I still wear layers under the Red Suit but under the older suit you could be naked and still get hot...LOL
Both Snosuits have a nice contour fit so they distribute the weight of the suit well.
Scott Steil