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I use a robofocus for both my telescopes. When you purchase this it comes with a custom adapter to fit the telescope focuser on your telescope.. It is not cheap at about A$500 but produces the desired function of providing very accurate fine control of the focus including fully automated focusing and temprature compensation which is almost essential once you have a fast scope.
The Skywatcher unit is purely an electric motor attached to the focuser without any of the smarts but does make focusing a lot easier and at the price is a very good option. It is not capable of computer control without first purchasing a FUSB from Shoe string astronomy.
Once you have had an electric focuser and in particular a robofocus or the Starlight equivelant you will never go back to manual focusing again.
Good luck.
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