I just tried a bunch of wetsuits for a recent purchase. I originally wanted the goldcore. Tried it on at scuba.com (near where I work) and, well, I couldn't get it on. I am usually sweaty when I put on any wetsuit and rarely have a chance to be dry-on-dry or wet-on-wet. When I finally did get it on another day when their air was working and I was dry... it seemed like an okay suit but having never dived with it, I don't know its characteristics at depth. I went with the hyperstretch. Took me all of 22 seconds to get the thing on and have used it on 5 dives since last week when I got it. It is by far the most comfortable suit I've ever had. I can even put it on under water, then my other gear (except tank) while holding breath then swim 150 feet in less than 2 minutes. Can't do that with any other wetsuit that I've used.
I just took it to 100' at catalina island (california) a few days ago and when the temperature dropped from 70 to 64 I could feel the cold outside the suit but it eventually warmed up and I wasn't so affected by the cold. My dive computer reads that my coldest in the wetsuit on another day was 62F and I didn't even notice it. I also don't dive with a hood usually.
Anyway, my last point is that it is just as easy to don if dry-on-wet, as well.
Edit: It also held up pretty well when surf entry/exiting over the rocks at Casino Point cataline island. But just beware of velcro. I've never had to peel so much velcro off anything in my life and it leaves artifacts of the event thereafter, though not particularily damaging to the suit.
Edit 2: Also, note, I like it cold. So while I may not have issues at 62*, I know my wife, in an 8mm neoprene, can't stand 68* water. YMMV.
Thanks