At the moment I edit via FCPX connected directly to a Lacie TB2 Raid drive as my project/render drive, and all works fine. Most of my video projects use 1080p footage - I haven't made the move to 4K just yet as I have no need. I have always been under the impression that TB is better then USB3 when it comes to editing due to the streaming of data over TB, compared to the packet sending of data with USB. However, with the high speeds of external SSD based drives now, and the capacities that are increasing (the Sandisk Extreme 900 is available at 1.92TB) Im after a small portable drive for editing when not at home with the main big TB drive. Anyone here edit over USB3?? Is it reliable? Any performance degradation to note?? Many thanks in advance for your input.