7-port USB hub with plenty of power

I have four USB powered external hard drives, which I keep plugged into my iMac all the time. My old USB hub was not able to reliably supply power to all of the drive. I got the Plugable 7-Port USB 3.0 SuperSpeed Hub. It's $30 on Amazon. It has a 25W power adapter and has no problem keeping all four drives running, and charging my iPhone and a USB portable charger at the same time (two of the ports support the Battery Charging Standard). All seven ports are USB 3.0 (backwards compatible to USB 2.0 and 1.1) so file transfer is speedy. It includes a 6-foot A cord and a 3-foot USB 3.0 Cable.