When my Hummer downshifted in cruise control, they were quite smooth. At one point after midnight, real quiet without radio, I asked my wife, "Dowshifted, did you feel that?" She said "what? no."
She drove with 2 sons to LA once, 14 hours round trip mostly with cruise control, she didn't think there was anything unusual about the cruise.
I don't know if it has anything to do with driver's experience or expectation. When it rains, some feel depressed while I feel refreshed. It is 98 degree today, some hate it but I say it is great time for a swim in the 90 degree pool water. There are Hummer owners here said interior is cheap, not enough power and all kinds of non-quality complaints, but I think the Hummer is beautiful inside out and powerful. or maybe I am just too easy to please.
Ed, you are too cheap, experienced, old and wise to fall for programmer or supercharger.