popatim is absolutely correct about the cost of a Thunderbolt drive. The only reason I have one is that I purchased a refurb from LaCie. I use it for backup on a MacBook Pro and can connect it via either the Thunderbolt port or Firewire 800. I use the Thunderbolt port and have no complaints regarding speed. I guess because of the Thunderbolt port the MacBook Pro does not have an eSATA port (unless the newer models do).