Swain is in our back yard, and do some of our coatings. I have nothing but good things to say about all of their coatings, they do their job well.
That being said, we have also used JetHot with very good success. Swain is the winner with regard to heat retention on exhaust coatings, but when you factor in time, cost, and appearance, the JetHot options do shine with their faster turnaround, larger color selection, very wear-resistant finishes. The Swain coatings are not as pretty, lighter in color making them staind out when you may not want them to, and not as scratch-resistant.