I have some cheap blinkies that will turn off with any kind of shock, even riding over a bump in the road.

That's one reason why I went to the Cateye TL-LD1000 as my primary taillight and the TL-LD500 on my trailers and as a backup taillight on the bike. I chose the 500 because it's also a CPSC certified reflector.

On the bike with no trailer I run the 1000 on the seatpost and a 500 on the back of the rear rack or a Mars 3.0 on the back of my helmet. With a trailer I run a 500 on each rear corner of the trailer.

I ride at night every day that I ride to work, and have had coworkers tell me that they could see me from over a mile away.