I had the privilege of diving with @CAPTAIN SINBAD a few weeks ago. Was my 1st Deep 6 suit I've seen in person. It looks like it has held up well. I'm sure he'll chime in, but to me it looked like a great suit.
I did notice a brass zipper on the front.. not sure if that's standard or you get a choice. I know most are opting for plastic YKK these days.
What would be the advantage of the plastic zipper? No need for lube? I've always preferred metal zippers over plastic since I was a young private in the Army. Learned real quick that the plastic zippers on the fart sacks jammed and broke much more readily than those with the brass zippers. Same sleeping bags, only difference was the zippers.
Did a couple days of diving this weekend and one had a Scubapro neoprene drysuit, Brass zipper across the back I would help him with. When it was lined up (suit "shrunk" on him over the years ) it moved easily enough, but when pulled slightly apart it was a hard stop.