So I'm reviving this thread since I was looking to increase import/ingest performance since I've noticed that the bottleneck to editing lies in that region. If you have to wait to see your files, it's going to slow down editing. I'm half cursing my 5DIIIs since they only support 1 UDMA7 CF and crummy non UHS1 SD card slot. Seriously Canon, WTF? So I'm currently using UDMA7 CF cards with a crummy class10 SD for "backup". I hate switching cards now so I'm thinking about just getting a much larger CF card (128GB or 256GB) so I can just have the one card in my camera with a second one for backup in case the main dies. I'm currently using the Lexar USB3 dual card reader since its the fastest one that supports UDMA7. I took a look at the Sonnet quad CF Thunderbolt reader but for the price, size, and usability, I might as well just stick with the Lexar and call it a day. I can attach 4 of the Lexars if I need to ingest up to 4 cards simultaneously anyways. Currently speeds are about 90MBps with about 120MBps burst for systems using SSDs. If you have a Mac that's older than 2011, these speeds won't mean anything since the speeds on those are pretty low even if you were using SSDs. Just thought I would share some of my research with FM peeps.