I am trying to decide if it's better to buy an blu-ray reader or burner for my MBP. My goal it to rip my blu-ray library for use with an ATV 3. External readers are much cheaper, and from my understanding, can be used to rip blu-rays into MKVs now. What other advantages are there of purchasing one with burning capability besides extra backup storage? Just want to make sure I'm making an informed decision.