I had a great talk with the maker of some great and not too costly gear today. I am going to purchase the $99.00 slider. Thought you might like to see this site:
http://www.indifocus.com/default.htm
http://www.indifocus.com/default.htm
Follow along with the video below to see how to install our site as a web app on your home screen.
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I built the DIY slider on a recommendation and have been putting it to great use.
http://www.youtube.com/watch?v=4wodYfeOGtE
It's not THAT hard to get a smooth motion. But if it was a longer rail I could see some wobbling problems.
That looks really awesome. For $100 it is competitive with the DIY slider, but I will point out that it's 24", and you can do a 1 meter (Roughly 40 inches) DIY slider for around the same cost.