I used to use AG but to be honest, since switching to Poor boys black hole and nattys wax I couldnt go back, wouldnt mind trying some of the Purple haze, AG just seemed so hard to buff of and left to much residue.

I have a g220 machine and it is great but you do need to make sure everything is clean as you can cause more harm if you start dragging dust/dirt around the paint. Also, if the car has been painted and you get a panel edge and thin paint you can go through but in general they are pretty safe.