Brake Light Flasher

Any body try one of these modules that make you brake light flash for a few seconds?? This one is $25 after shipping is applied.

http://www.amazon.com/FLASHER-MODULE-MOTORCYCLE-SCOOTER-REARALERT/dp/tags-on-product/B0036RFLR6

I have a flashing brake light on my other bike and really like it. I have had several folks tell me that it really gets your attention. I want to get one on my WRR.

Suggestions?

It sounds like a really good idea.
I dont want to be hit in the back by a car anaway,,,,

I did see some LED indikators tha other day that also had 6 red leds inside the orange ones that was supposed to be connected with brakelight.
But that was on a swedish page....