B,
I have the Redington CPX waders with the zipper which I won in last month's drawing. Sadly however I haven't had a chance to use them yet so I can't really speak to their durability. As the salesperson noted the zipper is the same one used by Simms in their G4Z Stockingfoot waders.
Beyond that I can't really make that many comments as to durability as I haven't used them or even owned them that long.
Hope this helps,
Brian
"My father was very sure about certain matters pertaining to the universe. To him, all good things - trout as well as eternal salvation - come by grace and grace comes by art and art does not come easy." Norman Maclean, A River Runs Through It