I have head-to-toe Insta-Dry, and you might want to check your facts. Insta-Dry is all neoprene, not rubber, just like most other suits. You may be confused by the fact that it is raw neoprene, and not covered in NYLON. The nylon layer slides easily, but doesn't seal as well, and holds water. The nylon is what makes most wetsuits smell funky after being worn for a while. Nylon and velcro pill. Neoprene does not. There is only one small patch of Velcro on my suit (the neck closure, just like every other suit out there).plwtwo:The suit is pretty much a straight RUBBER Material, not much neoprene. 1) Thats why it dries fast 2) thats why it's so hard to get on and off.
I have 5 Henderson suits; 3m Shortie, 2-3m, 5m, 5/7; all Hyperstretch, and love them. All but the shortie have 50+ dives on them...but the INSTA-DRY is a totally different creature.
The Insta-Dry is not instantly drying, but it is VERY fast, because there is no nylon holding the water. It's dry in moments in warm weather, with a quick swipe of a towel. It's dry in minutes in colder weather, with a slightly more thorough toweling. It's dry in under an hour in warm weather with no toweling at all, just dripping dry. (It's not magic, however, if you pack a dripping wet suit, you'll UNpack a dripping wet suit.)
It is very true that they are tough to get on at first, but they really do conform to your body and 10 dives or so come on MUCH easier. Mine fits like a glove now. Note that particularly hairy people WILL have a harder time than others with these suits.
I would buy another in a heartbeat for warm water. I'm not sure about colder water, however, only because I think I want to move to the integrated hood style instead of one-piece plus separate hood.
Downsides: They are expensive. How much you care about that is up to your pocketbook. And while there are some nice things about not having the nylon layer (better stink resistance, easy cleaning and drying), that layer is the one that take a beating much better than regular unprotected neoprene, so I don't think the suit will last as long as another might. Bear in mind that eventually any suit will need replacing if you dive it enough because the bubbles in neoprene compress over repeated dives and slowly lose their ability to rebound, so this may or may not matter as much for the super-frequent diver compared to the 2 vacations per year diver.