ScratchX is the most aggressive hand-applied product that Meguiar's offers. The product removes clearcoat to get rid of defects, it does not just fill them in.
The key to sucess w/ this product is the application technique. It takes quite a bit of "passion" to get the results you are looking for. Most of the time, multiple (up to 3 or 4) applications are necessary to get the best results.
I've had great luck w/ this product in the past. I have removed a leaf imprint from the hood of my Jeep and many light scratches (like those inflicted from dogs jumping up to your window to greet you) but I have never (and probably will never) use this product on an entire car (although someone on Meguiar's On-Line did just that on a Suburban of all vehicles!). However, if you do not have a polisher to do the work for you, then just plan on a weekend detail and have fun! Oh yeah, make sure to stretch before you start :laugh: