Rules Rules Rules Rules!!!!!!!!!!
I have Zip wrists and Neck. Have since before they were released (got 'em early from my buds at DUI...) Over the years, and hundreds of dives, they have not ever once "failed"...
I have, on a number of occasions, ripped a seal on-site - beach or boat. I go to my bag and in about 6 minutes I'm diving again. I have several buddys that have not been so fortunate recently.
I have mounted the DC dry gloves onto the Zip seals. HATE the DUI Zip gloves... they blow.
I'm not a mellonhead, so I have no issues with the Zip neck. It does add some bulk and a bit of heft to the neck area - whatever. I've replaced it on the beach one time, and kept diving - so the little extra care it requires is totally worth it.
I'm a little pissy that they're so expensive to replace - but its the price I pay for the insurance of being able to never, ever miss a dive because of a torn seal.
Did I mention how much I love 'em? Hundreds of surf entries and exits: rough, smooth, walk in, walk out, fall in, roll out... never a problem.
If you have the chance to move to them, do not walk. RUN. You'll never regret it.
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Ken