Conceptually bitcoin is good, however it has a long road to go until everybody use it(if it reach that day). We love "zhifubao" in china because if we receive a defected item, we could always refuse to pay the money, it makes the buyers safer(sellers too because if a buyer refuse to pay, he/she has to give the concrete evidence).
And it's quick.
For bitcoin, 5 confirmation? way too long.
And I can't get my coins back if the seller fraud me ? Hell I won't use it at all.
I guess that's why coinbase got its 30million dollars capital. However what makes it better than just a nother third party using bitcoin instead of any other currency? I'd say it's cross border trading, if any.
My 2 cents here.
So, why should I use Bitcoin instead of Paypal?
well, we hate paypal because they have a reputation of "protecting" buyers by screwing over sellers, and gradually charging exorbitant fees for their services. whatever paypal/ebay do, it is in the interest of swalling anything and everything in its path.. for the sake of dominance.