Nem on 06 November 2015
Since you only own a Wii U, i should warn you. Games on the X1 and PS4 use up huge ammounts of disk space. I would say a 1terabyte disk will hold you about 20 games. So... depending on how much you buy, you will be looking at investement on an even bigger HD, despitethe fact you will not get any returns on selling your used games.
Besides other risks already mentioned i consider going full digital a big and costly mistake.
