To be perfectly honest, I don't think its worth it.
I have been on the AMG advanced driving course, as well as the M Track Course (which only focuses on track driving, and no safety or defensive driving at all).
I feel as though there are too many people there, so you only have a very few chances to get it right before they move on to the next person.
I obviously struggled with the skid pan on the AMG course, as this takes a good few chances to figure it out. But if you didn't get it right after 3 chances, they move on.
With the M course, there was another gentleman who really struggled to get his lines right and his braking points correct. There was not enough time for him to get used to it without taking time away from other drivers (and the super long driver briefings).
If you're just looking to have some fun on the track with other people's cars then just look at those exotic car hire things.
If you want to improve on your safety, then maybe just look at a safety course.