I have a really big OS Systems drysuit that is over ten years old now. It is at OS right now getting "the works". I paid something like 400 for it back then new, and it came with full latex feet instead of ankle gaskets. I have been extremely happy with the suit, it's seen lots of river miles. A fair amount of my boating was coastal stuff, smaller rivers where a portage included crashing brush in dense forest.
I knew it had one pinhole leak, but they also found two other spots that needed attention. They are going to repair 2 leaks, and re-sew a section of the butt reinforcement then re-seal the interior of the sewn area. They said they would do all of the additional repair work at no additional cost. I am extremely happy with OS Systems. To me, a drysuit as about as important as a boat, maybe more. (Especially when you are an inflatable kayaker for years and years)
I had a Kokatat before the OS Systems, and it was okay. I had a crotch blowout when it was about 2 years old, and Kokatat repaired it for me for free. It took them longer than expected, and I ran the Jarbidge in May without a drysuit. (That sucked!) The material on my OS System Non-breathable is much better than the non-breathable Kokatat material.
Kokatat is a pretty good company, and all of my buddies have the Gore-tex Kokatat suits, some are as old as my OS. I paid a lot less for my suit, and I am extremely satisfied. I love the fact that they are located in Oregon, and you can drop you suits off at Andy & Bax and OS will pick your suit up there. Yes, I could ship it for cost of fuel, but then I wouldn't get to walk around the boat showroom and BS with Riley.