I have owned two Gortex dry suits.
If remember correctly the first one was purchased in 1993 or 1994. Definitely first-generation, as it had the "rubber" zipper instead of the metal zipper they now come with. The material was also considerably more heavy-duty than the newer ones. It was the old Teal/yellow pattern versus the dark blue/black that my current one is.
I don't remember anymore, but I had a ton of user days in that old dry suit before it was replaced in 2003. I sent it in for repair because zipper was leaking, they did a pressure test-no charge back then, which it Royally failed. In fact, they wouldn't even give it back to me. They classified it as a "Gore-Tex failure", and credited me probably two thirds the cost of a replacement dry suit.
So long story short, I was treated very well back then. I'm no longer boating like I did, and my current dry suit will probably outlive me-
. I do believe, that if I was using it as aggressively as my old one, the fabric would probably failed a few years ago due to the fact that the lighter weight fabric.
I recently had the gaskets all replaced in my newer dry suit for a spring GC trip, which went smoothly, and I think the turnaround time was maybe a week and a half. Okay, I'm fortunate that I was able to hand deliver and pickup.