I built two. Sold one to pay part of the cost of the one I kept.
I had some people over smoked two butts and that one sold that day.
The proud new owner was skeptical until he watched the smoke and watched the temp hang at 275° for about 10 hrs.
He talked like he was going to build one, but before he left that night,
I dumped the coals into my fire pit, let it cool a bit then we set it in the bed of his Chevy truck.
I have my eye on a new stainless steel drum at Buckner Barrel about 40 miles from my house. If I do that build, I'll sell my current UDS.