Just fitted a DUI with new on the market BDM / YKK plastic zipper waterproof. I think these will be the way forward.
The YKK has a positive slide in click when you close it the slider is chunkier and the closure is more robust. Otter Watersports Drysuits and DKG Drysuits have been trialling both zippers for a few years now. What really got me was in the Nullaboor the fine limestone did not gunk up the teeth like normal zippers.