By Quick Zip, do you mean the one that zips UP from just behind the right waist?
Yes. My strong opinion is don't opt for it (it's the standard, unless you ask otherwise.) What you really want is the "classic" zip, which is like a normal drysuit...at "open" the toggle's at the shoulder, and "closed" it's at the hip. I made the mistake of forgetting to ask for it, but fortunately, DUI did a poor job measuring my custom suit and needed to remake it, as the fit was terrible 'cause the factory rep wasn't paying attention to how _I_ wanted the suit made, but only paying attention to himself, and how he "thought" it ought to fit. When they remade it from scratch, I had them put the classic zip in instead, and it's far improved. I think the QuickZip is one of those, "if it ain't broken, we'll fix it anyway" situations on DUI's part, but, fortunately, you don't have to get it if you remember to ask not to have it. I'm sure there are a few people who might like it, but I've yet to find one who prefers it after giving it serious thought.
Seriously, though...the classic zip works better if you have wide shoulders, as it opens up a lot better at the top, which should account for most males. Also, the toggle of the QuickZip hanging out by your shoulder puts it in a very uncomfortable position if you've got on heavy gear - with the rebreather and only a couple of sling bottles, when I donned it, it dug in to my shoulder in a most unpleasant manner once I cinched everything down. I also found suiting up with the QuickZip VERY awkward...that weird reach-around-grab-your-butt motion to get it started, switch hands, pull the rest of the way, and try to finish it just wasn't cutting it, when a standard "classic" zip is a no-brainer to doff/don in but a few sessions.
As a guy, if you're not hooked up to a P-valve (factory "option" that is only optional if you're not male
), it's a lot harder to relieve yourself with a QuickZip if you're in all your gear... with a normal zip, you just have to open things up a bit and you're good to go, pun intended. I can't honestly say I always "hook up" every time I dive; fortunately, I've never, um, made the mistake of thinking I was hooked up when I wasn't
Zippers also don't like to be bent, period. It's the reason that shoulder zips in general don't last as long as back zip suits (although I'd never go back, as I do solo dive now and again, and you can't suit up by yourself in a back zip suit...it's also a lot more awkward to plug in the p-valve, but that's a different situation
) The QuickZip wraps around the body, which is one more bend-point in the zipper, and more non-symmetrical stretch/tension on the teeth. Maybe that's not a "real" issue, and I'm sure the nice folks at DUI might differ on their thoughts, but to me, that looks like a serious weak point that will wear out sooner and a good reason to stay away. Zipper replacement sucks - it's never as good as the original, and it's hard on the suit, although we've all been through it if we've been diving dry for any length of time. In fact, it was zipper replacement that killed my last suit. I sent it to KME for zipper replacement, and they screwed up the first attempt, had to take it out, and put another in...In doing so, they did enough damage to the trilam that it wore out really quickly in the fabric around the zip and the suit started resembling my spaghetti colander instead of a ziploc baggie!
To the "stiffer" question, my whole suit is the cordura, including the bottom. It is marginally stiffer than the poly bottom which is "standard", but it's not really an issue. The suit is heavy but still incredibly flexible and easy to wear... with the amount of undies I've been wearing (gearing up for 28 degree salt water in March) the suit flexibility is the least of my worries. The suit staying dry and being easy to doff/don, OTOH, is a big concern...