I installed mine and in less than a year the right one failed. The way it failed was it came on and stayed on constant no flashing. It also had a serious burning smell.
Since I also had Muth Signal Mirrors I stopped and unplugged the wiring and worked it when I got home. It was the bulb. I wrote SoCal about it,received no response but reordered the bulbs any way.I noticed when I installed the replacements they were different that the originals - maybe an improved design?
I will say this because I have found it true. There are many nice things for our Bikes but so far while the addition may work,I notice the craftmanship and life to be shorter than the original I have replaced.
Right now it is limited experience and I dont want to dog our sponsors,but before this is over my bike is going to be back to original if this keeps up.