I took paypal on my ecommerce site and it was brutal, you deliver the goods, you get a delivered receipt and paypal charges you back. The client says its not what they ordered and I say how the hell can that be. It is exactly the item, label, everything as on your invoice.
I think I wasted 10k at paypal before I stopped using them. Now as a client I love paypal, if something is not right I get my money back pronto. Mind you I would never abuse that but I ordered a vintage board game off ebay for $600 bucks and it showed pristine. When I got it it looked like someone had sat on it.
Paypal was lickety split and I had my finds back in my account.