piikki
Contributor
With a Bare suit (or any other than DUI) you have 4 seals to worry over most of the time: 2 wrist, one neck and the zipper. With DUI you have 7: the wrist seals and their zip seals, the neck seal and its zip seal and the zipper. Anytime a system is more complex there is more chance for failure.
I think you have misunderstood. One does not have to take zip seals with DUI. Most DUI owners do not have them.
I personally have never had any of my zips leak. Well once when I swapped one, and had not zipped it on before I went into water, true. But never a leak from a zip and nowadays I do not even bother to check them before dives as they have been foolproof (except for that one time). Seal change never took more than 10 min either.