Hub backwards compatible USB3 USB2 quite effective. I have found no side effects by connecting (see other reviews) For cons, I find it unfortunate that it is delivered with a USB cable as stiff and ugly. Here we have a beautiful object, completely in the look and finish of a MacBook Pro (it's real metal brushed aluminum finish) and is accompanied by a large and ugly white USB cable. The cable quality is impeccable, one feels that it's tough, but I would have expected to have a shorter cable, more flexible and more discreet. That's the only complaint I can do this Hub, which for the rest operates without worries on my MBP.
In the same brand, I recommend buying a USB hub only dedicated to the load. I can really become indispensable: ;camp=1642&creative=19458&creativeASIN=B00ODS2SJ6&linkCode=as2&tag=leblodeman-21&linkId=7DEONIK3XAOFPB7X
