I absolutely love mine, however I only use it for lighting not usb charging. For lighting, especially around this time of year when it gets dark at like 4:30-5 PM it's great. The biggest con is going to be price for you, especially if you are looking at more than just one wheel set. With cost of the hub(s) spokes, and labor not to mention a usb charging set up, it doesn't seem like a great idea for you IMHO. Surely, you will get some good pro/cons from the guys in the commuting forum as well though.

Shawn