The team uses pixelovely for sure. While Posemaniacs has a lot of poses, after doing a few studies with them a bunch of us noticed our work was a lot more stiff and off in anatomy. The 3D model is great and I love the way you can see things from different perspectives, but the problem comes when...those are just poses, they're not people and in some of those poses the model's muscle 'skin' can stretch or look weird which makes anatomical drawing almost moot.
I did a muscle study in school with the help of Posemaniacs and got read the riot act for using it. Muscle placements were WAY off, not because I had drawn it incorrectly, but my reference had it's muscle/skin texture warped in the pose. When I showed my teacher he kinda put the fear of god into me on that. I referenced medical textbooks from there-on out.
While I definitely see the use of using posemaniacs to get the very basics of odd perspective etc, I do not use it for studies beyond that. When you can study from life, when you can't go for a photo instead of a 3D model. This is my personal way of doing it. Your milage may vary.
C.