Wow... I can't believe the 513 is gone. My favorite model. I'm surprised we haven't heard from @Dancing Frog on this malfeasance. I wish PRS would publish some details about how the 509 and 513 pickups are different in terms of output and voicing. All I've heard are anecdotes that the 509 pickups are "a little more tele'ish in the bridge and strat'ish in the neck".