Having never really tried a formula, and always had results I liked, I tried the 3-2-1 in my UDS last weekend. The 3 hours was fine, and the ribs lifted out and wrapped in foil no problem. However, after 2 hours in the foil, when I came to lift them out and glaze to go back on for the last hour, they fell apart in my hand and slipped onto the floor in wet, sloppy pieces! They scrapped up good, and tasted great though! Now, I like soft - I like to be able to pull the bone free with my fingers when they are done, but this was too soft.
So, moral of the story, if it ain't broke, don't fix it. I am going back to my doing it by eye and feel, which is roughly 2-1-1 with the ribs rubbed, then glazed just for the last hour with Melado.