computer chip/ electric supercharger

if i were going to purchase a pcm for a 2002 grand prix gt, what would be a good choice? and what would the chip do for me? what type of gains? also i have heard that electric superchargers are a waste of money and suggestions? thanks

DHP pcm and yes electric hairdryers are a waste.

http://www.3800performance.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=DHP_PCM_GT_V1&Category_Code=PCM&Product_Count=2
FEATURES:
- Speed limiter removed
- 3-1 and 4-2 skip shifts
- Transmission line pressure increased
- Shift points moved (5800-6000rpms)
- Fan turn on points altered:
*** - 186 degree turn on
*** - 2 minute fan on at key-off (this feature activates when engine coolant is 179 degrees or greater)
- MAF calibration adjusted for proper operation and year
- Digital Horsepower Inc. fuel/spark adjustments:
*** - En-richens fuel delivery for critical problem areas
*** - Provides a consistent power gain across the entire power band
*** - Reduces spark retard (knock retard)
*** - Removes “40MPH WOT lag”
*** - Dynamometer testing has shown approximately 8-12HP in 60 degree temperatures on a development vehicle using 93 octane fuel.