Maybe it is just be B, but I found that the Tri-Lam folks here in Estonia wear just as much or more weight as me (neoprene) due to the buoyancy of their undergarments. I'm with you for very cold, give me neoprene! otherwise, I do like'em Tri-Lam or as discussed, the Fusion.I have a Bare XCD2 that I dive up here in Dutch Harbor, Alaska. I love it... definitely +1 for neoprene dry suits in very cold water. Water temperature is in the mid 30s right now and we're in our peak diving season!
If I lived somewhere with warmer water temps, I'd probably dive a trilaminate suit to save weight on the waist.
-B