I, too, have travelled twice on SkyAuction trips. Generally good, but clarify everything up front.
My first trip (Cancun) was flawless. I had a nice room at a pretty nice All-Inclusive. Great Deal.
The second time there was a problem, which SkyAuction quickly fixed. Travel was to a resort on Cable Beach near Nassau, The Bahamas. I had my VISA debit card on file as my preferred means of payment. When SkyAuction ran my payment, they had a problem but never notified me.
When I called to follow up, they stated that they could not accept debit cards, even with the VISA logo!? SkyAuction stated that they no longer had my room available. I had already purchased non-refundable airline tickets, and stated my desire that they honor the auction price for a comparable room for my travel dates. They found me a suite at a timeshare on Paradise Island and honored the auction price and dates.
I'd give high marks since they never tried to play the blame game, and were able to provide a satisfactory resolution quickly.