I got the gear wrnech set and one of the bar sets. I never touch the old crappy one anymore.....when the tools are needed.
****however**** there is a new belt on the market called a stretch fit belt. the vehicle has no tensioner. none. basically you loop the belts around all the pulleys except for the crank pulley that the tool uses. Then the tool rolls the belt onto the pulley as you turn the engine, its kinda hard to explain. Ive only run across 1 so far and if I remember right it was a mazda??? You have to have the tool for these belts or you can damage the belt installing it.
http://www.aa1car.com/library/serpentine_belt.htm
theres a little tiny pic at the bottom
edit heres a vid
<object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/Hbzb_37QUTo&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/Hbzb_37QUTo&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="560" height="340"></embed></object>