Yes -- the real downside of a dry suit for travel is the possibility of a failure you can't fix. I had a zipper go on a Mexican cave diving trip; not only was it not possible to rent a dry suit in the area, it wasn't possible to rent a thick wetsuit, either. All rentals were geared toward people who do short dives and few of them, so they were shorties and 3 mil full suits, which won't do me much good on 3 hour cave dives. Using a user-replaceable seal system solves the issue of torn seals, though, which is probably the biggest risk. Most shell suits can have small holes patched rather easily using duct tape as a temporary fix, so it's the seals and the zipper that can give you real grief.