Always always always use escrow please, boys and girls. No exceptions!
Don't fall for the friends-and-family-can't-be-reversed claim. That's a myth. Reversing it is easy. The sender simply declares that he didn't do that transaction and is therefore an unauthorized payment. It WILL be reversed.
But why would I refund in the first place if I'm BUYING PayPal? Doesnt it defeat the purpose of me buying? I am bearing the risks, not the seller.
I will tell you how this scam will start:
You will tell the buyer need to send first because he can reverse paypal this is how you will convince him to trust you.
The first payments will maybe go smooth until you will start to not send bitcoins anymore and run away.
There are endless examples of such scams on this forum, but if you are honest explain to us why you are crazy enough to accept paypal

Recent example of a such scam:
https://bitcointalk.org/index.php?topic=1970890.0He paid until he collected big payments then runned away.