I have 2 of them, and they both work perfectly. When I first received them, one was a little sensitive and flickered a bit. But this was due to a slightly loose track pin connection. A few seconds work with a pair of pliers fixed that and it's been perfect ever since.
My personal belief is that these are a very nice product, and they don't deserve the bad reputation that some like to give them. Even if the light does fail, they are still a great looking product, and the sprung bumper pad is great in helping to reduce damage if you do happen to accidentally ram them.