Don, I went for a "swim" when I got knocked off a rock at Beavertail a few weeks ago (the night before someone drowned the next morning). I was wearing my skinz, waders, and a surf belt (and pfd).
When I crawled out the only thing that was wet was my plug bag.
Well, okay, almost had to change my shorts too but it wasn't b/c of the aquaskinz...
On hot days you will feel a little damp from the retained perspiration, as they are not breathable. But you get the same problem with the Broncos.
-B