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As for neoprene vs trilam - there are advantages and disadvantages to both. If I were you, I would do more research (there are a few threads on ScubaBoard covering this) before blindly going with what the LDS salesperson is trying to sell you on.
As for the rings... I like the glove ring system. One thing I would change (too bad I didn't know better when I ordered the suit), is to have the rings installed while leaving the inner wrist seals intact. DC installed the rings directly to the sleeves. In the event of a glove failure/tear, there is nothing to keep the suit from flooding. Brrrrrr!!!! If you opt for the dry gloves from DC, don't go with their neoprene ones - they are notorious for failures. Go with the blue PVC smurf gloves instead.
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Many threads on SB about the advantages to each type of suit.
I just had the DC neoprene gloves installed on my O'Neill neoprene suit. I'll comment later as to how long they have lasted.
You can opt for a seal insert which would prevent suit flooding if your gloves failed. Howver, if you do so you must use a tube of some kind to allow air flow from suit to gloves. So even with this inner seal some water will enter your suit until you remove this tube. I opted not to have to deal with this and got the regular (open) wrist system. If I get a hole my suit will flood (as is the case everywhere else on the suit). Though I have the flood risk I don't have to worry about equalization in the hands via a tube, etc.
I have about 175 dives on my current O'Neill 7.5mm neoprene suit. I just had the zipper replaced but I plan to be more careful about waxing. We'll see how long it lasts.
--Matt