How does this compare to Rewind?

Rewind is a replacement for the in-game demo viewer as far as I understand (I have not tried it).
Our tool is not in 3D but offers a 2D replay of demos as well as visualizations where you can aggregate and compare utility, movement, etc. across multiple demos. You can watch videos of some of the features on the landing page -- and of course sign up for the beta and try it out yourself. We are still developing the tool, so new features will be released regularly.

i 'signed up' on your page - hope you let me check it out! seems like it could be useful. I've had a void in my life since statspy closed.