I was about to get one of those HF-Maddox kit...doing all pads this weekend. Then I was told about the free loaner tool deal at Autozone, by my VW tech, and A-zone says they have 6 kits to loan.
I've also got the Harbor Freight tool. It works fine and includes piston adapter plates for many different cars. Note when using it - the Left and Right calipers use different screw-in tools - both of which are included in the kit.
$37.50 with the 25% off coupon for it now is a bit much for it, I'd probably loaner thing at autozone and keep an eye out for a coupon. One of the many gems that Harbor Freight sells.