I just returned from a trip to southern Utah. Passing through, I checked some machines in Winnemucca, Elko, and Ely. I only know JOB, Bonus, DB, DDB, and NSUD well enough so I ignore other games. And I hit only a few quarter and dollar machines, making no attempt at a complete survey.
The best game I found was one 7-5 Bonus. Every other game I saw was shorted at least two notches. The worst game was a 6-5 Bonus with a reduced bonus table. Instead of the 400-200-125 for quads, all quads paid 150. FWIW, this was at the Copper Queen in Ely.
XVP: My big win on the trip was being drawn in the daily permit lottery. This allowed me to hike to and see the Wave. It's everything the pictures suggest.
Frank