Like Celia said,
Kokatat comes from the factory with Gore-Tex socks. They are great, one just has to be careful not to puncture the fabric by walking around on them. Latex sock are commonly installed after the fact, and I can only imagine that they are like wearing rubber socks. Eeeeww!
The double-tunnel is a great thing to have if you are going to be doing rolling and/or surfing, as it does a great job keeping water from leaking into the cockpit down the sprayskirt tunnel. The only downside of it I can think of is that it adds a small amount of bulk around one’s midsection. Small price to pay for a drier cockpit.
As for the relief zipper, look at where it is. If I need to become a contortionist to urinate, there is something wrong. I like the relief zip on my Kokatat suit, but it’s still not perfect. Then again, there is something about tender skin and huge zipper teeth that just scares me. :o)