Been using the Lumaray for about 2 months now, and I have no complaints. In flashing mode it gets between 6-7 hours, enough for a few days of riding. I guess it works, no one has plowed into me-- though no one had plowed into my prior to the Lumaray either.

Still using mine "upside down," mostly due to using a Wahoo and not a Garmin-- then there is that terrible plastic of the quarter turn. I don't trust it. I'm pleased with the light regardless.