I used my new 7/5 hyperstretch with a hooded vest on four dives over the weekend at Catalina, and it is definitely different. It does take in more water, and it feels funny as it drains when you get back on to the boat - actually, it was harder to get back on our small boat, but then, my previous wetsuit was part cork. The water temps ranged from 68 near the surface to 62 in one area at depth. It was not as warm as its predecessor at the beginning of the dive -- but it was also not as cold at the end, and there were no blasts of cold water anywhere when I moved. The flexibility was amazing - with my previous suit, with 14 mil of neoprene over my torso, my ability to move was severely restricted. The ultimate verdict - it stays in the closet! I may look for additional underlayer, though - the cold areas were arms and legs, and my previous suit did have 7 mil there - maybe 5 isn't enough for me.