Agree that the Dinotte is a killer rear light, but I do wonder if it's really necessary compared to something like a 1W PB Superflash at night. At night, the PBSF is really bright and really obvious if the batteries aren't run down. You really can't miss it. Add 2, and you can triangulate. If it's night out, I'm more than comfortable with PBSF, and I think there really is a decreasing return on brightness for such a "to-be-seen" light.
During daylight hours, PBSF is pretty useless in daylight as a rear light. I guess in this situation the Dinotte would be a better solution, but with such ambient light around, hi-vis clothing is really good, from all angles.
Not trying to knock to the DiNotte, but I suspect that all those rear light dollars are really on the decreasing end of bang for buck for the dollar as a rear light once you're over PBSF level lighting.