I know nothing about GS but do have CoachNet and I have to say so far they have been nothing but great for us. Last year on the way to Yellowstone we had tire problems and CoachNet had us new tires on in under 3 hours and we were in the middle on nowhere. The time would have been less but guy had to travel to another shop to get the tires which was in an opposite direction from where we were.
CoachNet service was worth way more than I paid for it.
John & Mary Jo
Enjoying the adventure