I have the 20 gallon mash tun, but I have had some problems with the fit of the false bottom.... The first time I used it I had a large amount of grain coming through even at the end of the sparge, because the false bottom is round, but the tank isn't totally round. I told John, and he was responsive, sent out a fermenter silicone seal right away which I used to seal the false bottom to one side of the tank. I brewed again with it, and it worked very well with the modification, but looks a little janky to me for a 400 dollar tank. I was hoping he would offer me a new tank with a better fitting false bottom, but i didnt have the heart to ask for it.
I have also noticed that the thermowell is a little too short to get a totally accurate reading. I use another handheld thermometer to check temps.
The welds are really nice, and after getting a replacement valve for one that wouldn't unscrew(John very helpful again, here) I am really happy with the triclover fittings. The tank is not very thick, but i wasnt super surprised by that, given the price The price can't be beat, but the wait for building the tank is hard to swallow.
I'm happy with my purchase, but my tank, at least, isn't perfect.