I've had once since they first came out a million years ago (I was a Peavey dealer and got one from the first batch they shipped to our store). I've thought about selling it a few times over the last ten years, but I figure it's a good standby to keep and it's worth more to me than the market price reflects. The "Equalization" tone controls are like a Fender preamp, and the 3-band "Voicing" controls are a three-band active EQ with boost and cut. Very flexible, natural sounding and utterly reliable pre.
Good luck with the sale, these things are worth more than they go for!
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"Without space, music is just noise piling up on itself." TRK
"Don't play your instrument, play music." Feral Feline
Lakland Owners' Club #248