Experience Blu Demo Discs: I Have A Question

[MJM]

For those of you familiar with the Blu-ray Demo Discs, I have a question.

With regard to the Experience Blu Demo Discs, there consists a Vol. 2, Vol. 2.1, and Vol. 2.2. Do all three of these stand up on their own, or is it a case where if you obtain any one of them, you're good to go?

I'm not sure what each disc has that the others don't, and generally, I was curious to hear from those who have knowledge on these Blu-ray's. Would obtaining Vol. 2.2 be enough, or does it make more sense to try and get all three?

Thanks.