Powered 48W 10-Port USB 3.0 Data Hub with 1 Dedicated 2A USB Charging Port, for Windows, Mac and Linux, by ORICO

I use this with my iMac pc and it works a treat (connecting some external drives, usb memory sticks and a card reader). I have been copying files from one plugged in device to another with no unexpected lag. It does exactly what I wanted, so a thumbs up from me.