I have no idea what you paid $430+ for on a 07 Yukon... but whatever.
That 430 probably includes an oil change and all their inspections. I will be surprised if they actually replace the air filters, brake fluid, etc. I'll bet they call you 3 hours later with a to do list and you end up paying $800+.
Get the specifics!!!
30K full service $6Bills
Yeah I always aim for the worst but hope for the best