I dived with Zip gloves for the last two years (a few hundred dives) - I hated donning my suit with the gloves on. After my right one started leaking this winter I moved over the the Diving Concepts gloves.
I'm never looking back. I put the suit-side ring on the Latex Zip seal (snaping the DC glove on and off) and just re-attach the Latex Zip seal to the suit. I have about 30 or so dives on my DC gloves so far and they've been perfect.
The $17 Glove replacement price (as opposed to DUI's $168) was the driver. I can't recommend this retro-fit enough to anyone with Zip seals. COVCI's $140 delivered is the best price I've found (apart from the eBay and TDS prices I've gotten.)
I love 'em. The Zip gloves were fine (although if they leak, I flood) - but I'm glad I made the move to the DC Gloves.
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Ken
PS: I always use a little dishsoap when I put on my zips.