pioneer mtx 9500l 12w7

Hello, im talking to this guy locally about trading my sub for his. Now i'm tryin to figure out if it is worth it or if im gettin screwed. I have a Pioneer Spl Champion Series(TS-W5102SPL) sub....6000max 2500rms dual voice coil sub....im hearing mixed things from emailers off craigslist. Lot...