Just being a wiseass, but I like them the way they come out of the "Crate" . .
Cheaper, actually, and generally with some sort of warranty. Unless you're just building 'cause you like to . .
Biggest problem with the "Hot tank" was/is the guy with the Hot Tank. Does he keep it clean, or is there 6" of slime and carbon in the bottom? If it's a slimy tank, you'll have to scrub the block with a bore brush in all the oil and water passages to get the slime and leftover caustic out, which can become a real PIA if you miss anything.