Experiences buying used cartridges

Well I am that Guy that bought a EPC -100 Technics cart from Greg / Victor or whatever his name is this week at GRG. Here is how this guy works. First off, if you have a problem he pulls the stall tactic until you are past the point of a pay pal refund and feedback on this site. (so if you have a problem with GRG right now, you better dispute your pay-pal ASAP) Then he does the old I did not get your emails, I sorry I was in Russia at the Olympics. Then he says, send it back and I will have it repaired. Then he never answers your emails ever again. He has your money and his defective cart back, then he then resells again to some other poor schmuck. I actually saw the cart I sent back to him advertised with the same serial number 2 weeks later. Meanwhile he answers all of my kids emails about other carts while he is supposed to be in Russia. When I finally did get him on the phone he threatened to have someone to pay me a visit to give me a beating. So I jumped on A-gone and posted questions to all of his adds saying stay away, he burnt me for $500. All he did was block me. Stay away from this guy unless your in driving distance to give him a personal refund, if you catch my drift.
I have had him banned from Canuck Audio Mart and US Audio Mart. He would not even make contact with the moderators over this dispute.
His tactics prevent users from getting their money back and leaving negative feedback.
He also goes under the handle ViraUSA
GRG Audio are thieves, run for the hills and never look back.

http://www.canuckaudiomart.com/forum/viewtopic.php?t=32853

  The same thing happened to me as what happened to analogluvr.  grgaudio sent me a faulty cartridge and wouldn't answer emails.  I sent the cartridge to Soundsmith to see if they could help and they said it was broken beyond repair.  Finally grgaudio answered an email, but said they wouldn't even discuss a deal that was done four months ago.  My initial emails asked about who did the retip, how many hours, etc.  The guy is a crook.  Of yeah, he sent me one cartridge that had one channel out.  I sent it back and he sent me the replacement...that was broken beyond repair.  Steer clear of this one.

I've bought 2. It seems to me it's OK  only if the price is low enough to pay for the cantilever replacement if bad.

I have purchased several used cartridges over the years.  I'ld say about 80% of the cartridges were fine.   Shure V15-III HE / Empire 2000Z / Empire EDR 9 / AT 33 ML OCC  /  Ortofon CG25DI MKII  /  Denon DL103D.  

I purchased the Denon knowing it was bad, and I eventually sent it to SS for a ruby level rebuild.  Excellent cartridge at a total cost of less than a new comparable cartridge.

Just my experience.

WOW, had an Empire EDR 9 once, won it in a Audio salesman contest run by Empire. 
I would give a thousand bucks cash right now for a genuine NOS one in a box.