I can't speak to the products yet, however The 15% off deal Adams is running this weekend (ends today IIRC) was enough to put me over the edge. I ended up with one of their PC kits and some odd and ends.
The Adams videos on youtube are pretty good, however I found that Junkmans videos were a bit better. There is one that shows him more or less beating on his vette with the PC was what I needed to take the plunge, that... and I have the wife's car to experiment on before going at the Z.
YouTube - Junkman2000's Channel