I have a little over 900 dives on my current drysuit, a DUI CF200x, and it still looks new. Recently, the zipper wore out, leaving me with the most uncomfortable wetsuit you could imagine. Surprisingly, the neck and wrist seals remained in great shape and as watertight as ever.
However, since it was going in for a zipper, by changing the seals at the same time, I saved hundreds of dollars by doing them together. What a great move. Zip Seals have mating plastic rings that make it possible to change seals in the field, and change accessories like dry gloves and hoods, as conditions dictate.
I’ll be weighing in on dry gloves later, but the major immediate benefit is the fact that you can carry spares and ensure that you won’t be canceling dives after you’ve already arrived at the site. If you are thinking of buying a drysuit, DUI is as good as it gets. The Zip Seal option is something I wouldn’t think twice about adding. There wasn’t such a thing when I bought mine, but I’m really happy that I have them now.