Never had aproblem using Paypal to buy from
Ebay or online shops - I prefer it as you don't have to fill all the bloody details in every time.
The only time we've had an issue is selling when somebody paid through Paypal using a stolen credit card. Paypal sent the money through and then snatched it back, days later, when they discovered the truth about the card. Too late for us as we'd already sent the stuff out.
So, buy - yes.
Sell - yes, but only when funds have cleared into the bank.