I Purchased a Imac Pro 2 months ago and I have been looking for a way to connect my perfectly good Firewire 800 drives. I ended up keeping my cMac Pro and setting it up as a server so I can access my old drives over the Ethernet in my house. Works fine but running up and down the stairs is getting old. I have the worlds largest firewire dock. Had a DUH moment at the Apple store when I picked up my IMac Pro. I assumed the the Apple firewire to thunderbold dongle would work but NO. The sales associate took it out of my hand and showed me that the TB connection was different and NOT compatabile.