We purchased a 2007 Yukon XL from another valley dealer but decided to have GMC Henderson service it since they are closer.
The service personnel were friendly and helpful. I bought a 3-pack of oil changes which was a good deal and I like that they are looking for ways to save customers a little money! The service itself did not take too long and they finished a lot faster than I expected. I appreciated it that they provide a courtesy wash of the exterior.
When the front parking light required the front bumper to be removed and a $4 bulb ended up costing us $150 in labor costs, the service manager was very helpful to negotiate the price down to a more reasonable rate.