I've taken a few of them.. I find that the PS is very calculation heavy compared to the few AAMCs I've taken. I also think that the BS has a lot of trivia compared to the AAMCs. Finally I think the VR has passages that are too long and questions that are very different from EK101/AAMC. I've been consistently scoring ~10 on EK101 VR.
GS1- 6-6-10
GS2- 9-8-9
GS3- 8-7-9
GS4-8-7-10
AAMC3- 8-8-9
AAMC4-10-7-10
I think I'm going to continue to take them for practice. I'm finding that the practice is helping me with my test taking strategies/focus.
I'll be taking the rest of the AAMCs/GS and the real thing in the next couple weeks so I'll keep ya updated.