I've been using Rhino House for a long time and it's a must have tool for animators! Highly recommended!
I got the DVDs as well but the online portal is really slick. The analysis tools are very neat.
And to add to their awesomeness, if you join my workshops or classes you'll get a huge discount on their monthly subscription!
Head over to rhinohouse.com or their Facebook page for more info.
Rhino House from Rhino House on Vimeo.