I know this is a late post on this topic but I wanted to relate my experience with the eBay/PayPal dispute resolution process.
I ordered a used GPS unit that turned out to not be fully functional as indicated in both the eBay posting and in an email I received from the seller.
Once I realized the unit wasn't fully functional (you couldn't download any map updates to the unit) I contacted the seller and his position was that it worked fine when he sent it to me. I then submitted an official dispute with the PayPal dispute resolution center. They looked over the sellers initial posting and our communications and indicated they had awarded me a full refund providing I sent the unit back to the seller and posted tracking information with them. I did all of that but for some reason PayPal said my tracking number was invalid and they were then reversing their position and thus denying my claim. Needless to say, I was dumbfounded and responded with a copy of the tracking number, which by then, showed that the seller had received and signed for the returned unit. The initial reply by PayPal was that the last decision was final and there was nothing I could do about changing it. That really made me mad and I started probing the PayPal website for additional contact information. I finally found a phone number to call. After explaining my problem the person on the phone said all I had to do was to submit an appeal to the resolution board and they would then review my case once again.
After about two weeks of hearing nothing, I got an email saying they had reviewed my case and were depositing my money, including all shipping costs into my account. Two days later I had my money.
The downside was that I was not able to post a feedback for the seller on eBay since the transaction simply disappeared from the records - just like it had never happened. I was tempted to buy something (anything) from him just so I could give him a negative feedback and comment but decided it wasn't worth the effort.
Bottom line, PayPal came through for me in the long run. The process was painful but it was well worth it to me as the transaction was over $100.
Some folks simply don't like PayPal because of their fees. While I don't like them, there aren't many other choices for doing business over the internet and that is, for the most part, pretty hassle-free for myslef and my customers. You have to pay for the convenience of the services offered. As I see it, it's just part of the cost of doing business.