Its legit, I have used it few times for paypal. As amacar2 said because of its inbulit escorw its good for dealing with paypal.
I have said it can be considered safe if you are only dealing with trusted buyers with good past feedback. Inbuilt escrow they have can't protect you from chargebacks which can happen within 180 days from date of exchange specially in paypal. So quite risky as buyers can file chargeback after few days when you release bitcoin to them.