My father's listed three things on Trading Post.
Pros - there was no listing cost; it was easy; final fee was fair.
Cons - darn, it was such a HORRIBLY slow site (I don't know if it's any better now); there was no way to obtain the winning bidder's telephone number if they didn't answer their emails, so when someone doesn't know Trading Post works, and just doesn't check emails from someone they don't know, you can't (or couldn't at that time) get in touch to check with them.
It might have fixed some of the website problems by now, and it may now allow telephone details to be obtained by trading partners. If so, well, that's a big move forward.