I know that many brewers use it without any problems, but I just couldn't bring myself to buy an aluminum pot. We decided just to add a 4th converted keg for the time being and use our old SQ14 burner in addition to the 3-burner stand. So back-to-back batches should work fine for doing 20 gallons total, without too much added time.
It would be great to move up to a 1BBL system down the road but there are so many other considerations that drive the price up (new fittings, new pumps, larger/wider stand, etc.), not to mention the cost of the 1BBL vessels themselves.