In principle, this gadget is excellent. It occupies two ports and gives you four ports. Its design is simple and once connected it actually works as it should. The only problem is that it's difficult to connect to the Surface Pro. The dimensions on the docking station are slightly different, but that's a lot considering the small pins in each of the two ports. Other reviewers couldn't connect their devices at all and had to send them back. Mine connects but it's hard to do.
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