I don't do it, but know someone who does, and have occasionally tried to non-rev through MSP...

IT SUCKS. It's a DL hub on both sides, running only 5 narrow bodies a day. All mainline. As SLC is a senior mainline base, a lot of SLC locals commute to the other hubs for work (in the hopes that in a few years they can hold home SLC), and when ALL DL MAINLINE EMPLOYEES even a brand new one with no seniority boards before you as connection employee do, IT EQUATES TO MAJOR SUCK.

Don't do that commute, if you commute between hub cities, make it different airlines hubs on either side, not the same airline. This scenario always sucks.