I've heard enough good reports from them that I'm probably going to use their stuff to paint my XJ during its refit.
NB: Three-fourths of a good paint job is in the prep work! I don't know if you know this, but someone will probably read this who does not, so it needs to be said.
If you're painting over an existing coat, here's what you want to do:
1) Knock the clearcoat off with 180-220 grit paper. You don't need much, and you don't want to remove the colour coat.
2) Let the dust settle, even if you used a sander with a vacuum attached. The vacuum won't get everything.
3) Clean the area where you're going to paint. Don't sweep it with a broom, don't suck it up with a vacuum - blow it out with water (air hoses just stir the crap up. Water wets it down and keeps it under control.)
4) Clean the dust and fingerprints off of the parts right before you paint them - using a clean lint-free rag and something like acetone, lacquer thinner, or denatured alcohol works best (wets the rag to pick stuff up, dries rapidly, leaves no residue.) Change rags often.
5) Wait just long enough for the last of the solvent to evapourate, then paint. Multiple light coats are invariably better than one heavy coat - so work slowly.
6) Any runs, drips, or sags can be knocked down later, using 220-grit or finer. Since Gillespie implies that you're going to use a matte finish, you don't need to take as much care as you would with gloss and clearcoats (surface finish isn't at issue here.)