I have used this site for years, and have had few problems. Purchases are easily completed and arrive quickly, and many of the sellers are very accomodating if you have problems with the purchases. I have also sold successfully on this site and had good customers.
In ten years, I've only used the dispute process three times, but found it to be very easy and obtained a refund with no problems though paypal. I love this site and will continue to use it for many years to come for all my online purchases.
I have also successfully sold several used items on ebay and never had any problems from my buyers, although browsing the forums will turn up some horror stories about dishonest buyers. There is scamming on both sides of the deal, but most people who use ebay are honest and just looking for a fair deal for their money, which I try to provide. I'm not too into their new rules about waiting for your money until you can prove an item is delivered or 21 days, but using DC will help fix that problem.
I have also called their customer service and managed to get my problems taken care of quickly and with little problems. I like ebay, its all around a great site.