I'm fairly sure it just takes a little longer to clear into your paypal account ... if it all goes tits up paypal and ebay have a much easier and quicker system to deal with non payers and get a fee refund.
wouldn't take a low feedback count as possibly a non payer, everyone has to start somewhere.
Biggest problem for me, with ebay, is buyers who dispute an item after they get it, description or whatever, as paypal then block the funds in your account and it can take ages to resolve. Ebay system does tend to work in the buyers favor.
My No 1 tip for ebay sellers would be to make sure you can prove the buyer has received the goods. If you can't the buyer will almost certainly get a 100% refund if he says he never received the goods. ie, you sell a camera, they pay via paypal, you either send non signed for, or buyer collects from you a week later, you have no protection at all.
Anyway, good luck and hopefully you'll be posting up in the not to distant future that it all went smoothly ...