I sold a .org with them a while back they ended up taking 50% of the final sale price. They sold it very quickly but of course that 50% commission is pretty crazy. I was just getting started and had no idea how to sell a domain so I took the "Easy Way Out" Have someone else sell it for me.
Lesson learned though I probably could of sold it myself but if you are not having any luck selling it give them a try. Still do your research and look up recent experiences since mine was about a year back. I believe there was a change in ownership as well.
- Will