Should I get a performance improving micro-chip for my common-rail diesel engine?

I've seen micro-chip kits for common-rail diesel engines that are supposed to improve the performance and/or economy. Are they any good? Would you recommend one? Thanks.
I love mine! Much faster horsepower. Check this out.
http://www.dieselsmoke.com/





Schwinn Thrasher Adult Micro Bicycle Helmet (Adult) Reviews: Schwinn Thrasher Adult Micro Bicycle Helmet (Adult)...
Schwinn Thrasher Adult Micro Bicycle Helmet (Adult) Reviews: Schwinn Thrasher Adult Micro Bicycle Helmet (Adult)...
Schwinn Thrasher Adult Micro Bicycle Helmet (Adult) Reviews: Schwinn Thrasher Adult Micro Bicycle Helmet (Adult)...