We had no problems what so ever with warranty issues during the first year of ownership on both of our Montana's. We also had good success with repairs after the warranty period at no cost to us.
We had no problems with our extended warranties on repairs as long as we complied with the terms of the warranty.
Most of our repairs both in the manufacturers warranty and out side of the manufacturers were done by the Keystone service center or a repair facilities in the Goshen, Elkhart area since we are fairly nearby those facilities. Our selling dealer was good as was a mobile repair service here in Florida.
We have just not had a bad warranty experience....... yet...
2013 Montana 3402 Big Sky. 08 Ford F-350 6.4L