Is anyone running a Knock Sensor like the J&S Electronics unit in their L?

Would this be a good "reliablity mod" Or a waste of money (they go for $500ish)?

I plan on getting the 'usual' mods intake/chip/exhaust and most likely NOS.

The J&S unit is also an air/fuel meter. I have it in my turbo car and love it.
http://www.safeguard.bizland.com

-Dreamin
'00 L

 

For whats it's worth, I believe the Lightning has a knock sensor in the valley under the supercharger. I dont know how well it works though with chips and other mods.

Mike