Works without problems. So far I've only tried inserting a micro SD card and then plugging in 1 5TB portable hard drive to the only USB 3.0 port and 1 2TB portable hard drive to one of the USB 2 ports. I didn't do anything complicated, didn't watch any films or anything like that. I just checked some documents and photos. There were no problems. The only problem I have with this device is that I already have one of these, but it doesn't have a card reader, the lention (right side in the picture) is a bit thicker, not much, but the edges are pretty sharp, noticeably uncomfortable , to last even a few seconds. My other has smooth rounded edges. It's not that it's sharp enough to cut your hands, but it's really uncomfortable and should be portable so you can handle it often! just a little thoughtful design details!