I am on my 3rd Rear Light in about 12 months. (i find the batteries last longer than the light itself)!
The problem is that the Attachment/Bracket and the Body of the lights all seem to be joined together with no real thought to the bumpy and rough nature of actual riding.
I find that after a little bump / speed hump or dropping off a gutter the back half of the light will pop off and smash onto the ground. They seems to survive the first few smashes but eventually a car will run them over or a similar fate will befall them.
So anyone know a real tough and intelligently built rear light?