Defrag: - the boxes come pre-painted in various colours (powder coated) from Small Bear. I chose the white/black theme because it thought it looked "clean". - yes, the traces are "tinned" copper. I usually do that in case the fabrication process has left a hairline crack in the copper. The optical transfer of the image can be a little tricky.
I've played with the FA-1 a bit now and I can say that I probably wont be able to live without it in front of my Fender from now on. Just brings it to life! If you have a Fender, you gotta get an FA-1.
Not such a difference in front of the Marshall though.
Best position for it (no surprise) is directly after the guitar - the FA-1 almost completely removes the load from the pickups. Current setup is: Strat - FA-1 - A-B switch (A=pedal chain, B=TU-2) - MT-2 - etc etc.
Wind the distortion down on the dirt box, and the volume, treble and bass on the FA-1 up a little and it brings out a really nice Fender-y dirt with a little colour from the dirt box plus the Fender pre-amp overdrive from the increased volume.