Our first lienholder required the use of Auction.com when we went through the short sale process. They won't allow the sellers' agent to conduct negotiations and instead "do it" themselves. Their idea of negotiating is telling the second lienholder they must accept X amount or 'we' (sellers I presume) will sue them. Many, many months later the second lienholder approves the offer. Settlement is scheduled. A week before settlement was to occur, the first lienholder now denies the sale because after all this time the appraisal had expired. Of course, the house appraised higher. The buyer wouldn't increase his offer so we were back to square one.
The 'negotiator' at Auction.com would only ever want to communicate over the phone. She never had anything to say - just kept repeating herself, giving the same non-info in various ways. She told me the second lienholder had to accept the first's offer. Okay... then why aren't they? She gets the second lien rep on a three-way call and tells him that that company is terrible. That certainly didn't light a fire under anyone to get the deal done.
Since it fell through, we relisted publicly. First lienholder sent it to Auction.com who advised the realtor to list it with certain language. She ignored the directive because we already had an offer in hand that was over the asking price. Luckily, no one bid, and Auction.com was no longer involved.
Not surprisingly, the realtor's negotiator got results much, much more quickly than the people at Auction.com. We are finally rid of the house we tried so hard to keep (but couldn't sustain because of non-paying renters), no thanks to Auction.com.