^ Yep and I believe I read somewhere that you can email Jon at Naiant about getting new PFAs made.
As far as a sound difference, I don't know that I could tell too much of a difference switching between bodies/actives - they both sound great. It's a heck of a lot easier setting up actives though, and saving a few minutes during setup/teardown at each show is valuable enough for me to justify the expense, not to mention the size advantage.