Having a 2nd PF15R around can come in handy for more than just a backup. If the venue/audience of a gig is larger, I use an ABY box and play through both of mine, setting them up on either side of the stage/staging area. Moves a bit more air, spreads the sound, and carries better. Playing through two PF15Rs at once also allows you to have different settings on the amps and/or to toggle between them. Played this way at a 4th of July party for a large church, noisy crowd of 200+ eating in the fellowship hall. The setup worked great. The Pathfinders weren't mic'ed into the PA, they played straight to the room, and were sufficient to the task. The Reverb on my brown grill cloth is stronger than on the black one. I don't know if it's because the black one is older and therefore weaker, or if there were issues to begin with, but the brown has a bit better Reverb.