Ok, old thread revival alert, but this existing thread was so on point I didn't see much sense in starting up a new one.
My wife and I have now had direct experience with both Stohlquist and Kokatat on our drysuit odysseys.
For me, it started with a $200 imported Stohlquist mult-sport drysuit I bough on sale from CRG around 2006. I never had much opportunity to wear it until the infamous Tappan Falls Maytag trip in 2013, at which point it leaked through the fabric so bad that the legs would fill up like water balloons and I'd have to drain it out through the ankle gaskets. When I called Stohlquist after that trip, they told me that "lifetime warranty" meant lifetime of the product, and on that particular cheap drysuit that meant 7 years, so I was SOL. After some complaining on my part, they offered me 1/2 price on a new AMP, which I ended up doing. The AMP is made in the USA and is actually a very nice dry suit, other than I look like a tomato.
We purchased a used Kokatat for my wife off ebay in 2016. I don't know how old it was, but we had to replace a latex bootie and it was a purple and gold color, so guessing 1990s just on the color scheme alone. It worked well (other than no relief zipper) for a Selway trip and a Middle Fork trip in the last couple of years (both of which she had some out of boat time) and she stayed nice and dry. The last day of the MF last year the neck gasket ripped. I decided to have Kokatat do the repair, so I went through their process and paid for the gasket repair and a pressure test just to get it all good to go again. I shipped it off and got an email from them a couple of weeks later informing me that they had found a warranty issue with a seam and they had decided to replace the old suit with a brand new goretex front entry drysuit with a relief zipper. It arrived last week and is a thing of beauty. Oh, and they refunded the money I had paid for the repair, test and pre-paid return shipping.
To say the least, Kokatat has made another fan(s) of their amazing customer service. I would have been perfectly happy if they had just done the repairs I had paid for and never mentioned the warranty issue (I still have no idea what it was, other than something about a seam). Incredible.
So, for others stumbling across this thread, you definitely get what you pay for with Kokatat. You will have a dry suit for the rest of your boating career if you go with them. Stohlquist, not so much.
Show me your OOOOOO face