I came across this website while looking for high speed impact photos for a different debate.
www.lindsayputters.com
LOTS of really cool information on his site and even some neat testing on how to test for backspin. Seems to make sense too because they were using a Yes! Golf C-Groove putter and it showed that the putter did what it claims by eliminating skid faster and creating a better roll faster.
If you look on the site you'll see that the backspin it creates initially is A LOT LESS than the Odyssey 2 ball.
During his testing if hit perfectly on the sweet spot it did creat positive overspin.
I have emailed the guy a little bit and he fowarded me a video that will be put on the website soon and with his permission he said i can show it to other people:
www.lindsayputters.com/demo.htm
Interesting stuff, let me know what you think.