The USB 3.0 hub is great and fast. I use it along with a MacBook Pro and have both USB 3.0 including 2.0 disks (with and without extra power supply) and other devices connected. But if I my new USB 3.0 flash drive from SanDisk (SanDisk Cruzer Extreme USB 3.0 Flash Drive 64GB) connect, all other connections are briefly interrupted. That copy operations are canceled thereby is the logical consequence and very troublesome, but also this is the Mac especially annoying, since it always brings ne error message that I have not thrown my hard drives. Whether this is the USB flash drive or attached to a hub, of course I do not know.