I got a pair of the LL bean zip up guys. They are very handy. I was skeptical too, but pulled the trigger anyway. So far. I'm very pleased with them. Zip, zip, flow. Zip, zip go. Boom, done.
I have a pair of the Orvis waders. Orvis gives you zipper wax to help seal and lube the zipper. Mine have never leaked and I do like how easy they are to put on.
I got a pair of Orvis zipper waders when they first came out used them hard (200 + days a year) they are starting to leak a little but not the zipper I woul d recommend them
The old leaking near the zipper of 15 years ago has been solved.I believe all of the zippers are made by an Italian company(no jokes please).I've had a pair of Hodgeman zippered waders for 8 years and still no leaks.