I need to get a mains powered USB hub. I don't play computer games so lightning speed isn't much of an issue. I'll just connect a printer, mice, keyboard, an MP3 player etc and charge my bike lights, cameras, and extremely stupid phone. The usual guff. Do I really need a USB 3.0 hub? I can get a 2.0 version with 7 ports for under a fiver. Have I missed something? Actually, almost certainly.