I like Payal for the buyer protection. As a seller, not so much. Their fees are quite steep and like others have mentioned, the dispute resolution process is often arbitrary and biased towards the buyer.
Ebay and their new financial system is not much better. I recently sold my AT 8900 on fleabay - fees were almost 10%. The buyer test-drove my watch for over a week, then opened a case for "item not as described." Ebay notified me that the buyer opened a case and they had resolved it in his favor and that the watch has been shipped back to me - no opportunity for me to participate. Buyer was refunded 100% of his money and I lost the shipping and insurance costs.
Watch came back with a scratched up bracelet, scuffed up wooden box and a torn gift box. At least Ebay is offering to compensate me - they're asking me how much I want, but I don't know how to put a dollar figure on it.