Ham exercise on a budget

[DEADn]

I came across this video and was astounded at what this guy put together. Initially I saw how be put together AB wheel exercises. Now this for the hams. I did it and felt it hit my hams and my lower back. Makes me wonder how much good this will do for deadlifts.
See what you think.

http://www.youtube.com/watch?v=u5xKHn_RlZs

[BigChrisF]

I've done a similar idea before. I didn't use sliders, I just put my feet on a chair while lying on the ground and tipped the chair towards me as I raised my body up.