All the responses so far have been good with good advice. Here is my take , I got a new Pinnacle Extreme for x-mas 07 - 08 . Dove it thru the ice , not a problem , made another dive in open water , the zipper came out . 2 MONTHS later Pinnacle sent a new Extreme , with a "new " zipper . Suit never left the LDS you could see the zip coming out . 3 more weeks go by and They send me a Kodiak, first dive the teeth of the zip pull off.Now it takes another 3 weeks to get another Kodiak with yet another "new" zipper , I have not had the chance to dive this suit yet because of the ice so only time will tell. None of the zippers were stressed , they were all closed when they failed.
Good Luck