I've been commuting with one for about a year. I don't notice the extra weight (indeed, during the winter I added a niterider 1100 atop the helmet ... so with it off, it feels like a light helmet!). I get a lot of comments from drivers about it; so clearly some are paying attention.
Turn signals are great; the blinking front light ... could do without (since I already strobe lower down ;>). The brake light operation seemed pretty off so I disabled it.
I ride about 2 hours a day, charge every night. Seems to have about the same capacity now as when I started. The bluetooth % reporting seems to be relatively inaccurate (viz. inconsistent from ride to ride), probably temp sensitive.
I picked up a spare charging cable so I *can* charge at work; but I don't usually. The magnetic latch is a nice idea, but seems a bit temperamental. I'd have much rather they went with a standard (microUSB for example).