I'm using this on my iMac with three iPhones, and an iPad. I was able to update the software on two of the phones, and sync data on all devices, all at the same time. It does charge the iPhones (all at same time), but does not charge the iPad (but the iPad has never charged off my keyboard due to its power requirements). It has a nice, slim design, is compact and doesn't take up much room. The performance is great. This is a big improvement over the USB buss in the keyboard, which only allows for one device at a time. I plugged this in on my iMac keyboard USB buss connection, and the power supply is plugged into an outlet (very simple to install and operate).