Hi Jeff,
Believe me, I have no problems buying used equipment, almost everything I own is used. I also trust most AudiogoNer's, generally this is a very good group. My biggest dissapointments have been when buying used cartridges, NOS tubes, and used vinyl. I find that the AudiogoN rating scale is of no use in these areas, and some individuals ideas of usage and quality sound are very different from my own. I tend to buy these items new now, except for NOS tubes, which I only use reputable dealers who accept returns.
As for cd players, amps, preamps, speakers, turntables, etc...I have had no issues whatsoever, aside of shipping damage (knock wood).
I have purchased used cartridges before and been happy, and hopefully you will be too. All I'm saying is that this is one of the riskier gray areas here on AudiogoN, as condition is not as easy to quantify. The offer to return if not happy sounds promising, though a bit brave on the seller's part. So you both are taking a leap of faith. You in that his description is accurate, and him in that you can properly setup and align the cartridge w/o any damage.
Hopefully you are both rewarded.
For the record Jeff, I believe Bill's (Audiofeil) comment was made with tongue firmly implanted in cheek. :)
And yes, life is short, and we can't worry about the little things, and cartridges certainly are little things, so there you have it.
John