My shameful brain can and will forget to turn the switch off, so the charger/accessory circuit on all my bikes is powered by a relay. That way, I get full voltage and it shuts off automagically.
Also, if you plan to run an air pump through one of these circuits, install a bigger fuse. 10 amps will blow sometimes, 15 should be OK and still plenty safe if you get a short.
That particular gadget seems ridiculously large, and the lights would be distracting, but I guess that's a matter of personal taste. There are lots of neat USB charging widgets on Amazon and Fleabay.
2002 Suzuki DL1000 V-Strom, Dark Metallic Space Blue
1983 Suzuki GS850G, Cosmic Blue
2005 KLR685, Aztec Red - Turd II.2, the ReReTurdening