I used them a few years ago on my Hummer - after i chased off the "Big-Company" guy that really did not want to do anything [they are the insurance company's default]. i think that was the first time someone had called him on attitude - he really really did not want to leave
SAG was helpful, polite and worked through a difficult job. they really wanted to do the job - and do it right!
i now have a claim on a Mercedes - and the Insurance company lackey firm again tried moving me to their affiliate - i am telling them it must be SAG