Hi! I use a thunderbolt SSD as primary drive (OSX on it) with my imac, and when i want, i can attach it to my mb air, having all same configurations, files, and everything else, like on imac. problem is that i cant use this solution easily in all situations. attaching an external hd while in plane, or in the car its not the best. im thinking to get an usb 3.0 pen drive ssd. my question if usb is stable and reliable like tb. speed isnt a problem, 5gbps is enough anyway. please dont tell me to find other solutions like cloud or apps for synchronizing files. this is best solution for me and maybe the main reason osx its better than other os's!