I couldn't say enough good things about the workmanship of this guy's products. Definately blows the pants off some other manufacturers with "clubs" here in RC too.
I have a custom Ca reactor, which I believe it was the first or second he made that big. It is a 8" diamter and 36" tall with a little giant pump for recirculation. It works like a beast and I am yet to have any issues whatsoever with it. It works great from day one. Dialing in that reactor took me less than a week. Everytime you made a change it would only take 3 hours to equilibrate. I am telling you, I could not say enough good things about it. It takes about 50 lb of media or about an entire bucket of the 200g of salt of IO.
I have a custom kalk reactor as well. It is 8" diameter and 24" tall. Works like a charm. After having the 2 different versions of the other manufacturer's magnetic stirer design, I can now see how a real kalk reactor is supposed to work. My god, I should have gotten it from the very begining and save myself money and headaches.
I will also shortly order 2 different custom media reactors, one for carbon and the other for phosphate removing media. I may end up ordering a needle wheel skimmer too like Dendronephthia, but with 6 pumps instead. That last one I haven't decided for sure, but I can gurantee you the cost is so much less than the equivalent version of H&S or Deltec.