Go for it....and something to think about.
I'm using the Maptune stage 3 product, and about to get the next upgrade to stage 4...
The boost is incredible...after preparing the car in stages to make it safer and more fuel efficient before ordering the ECU ...I replaced items that allows the car to be more fuel efficient first. Then I began my upgrades, and I felt an immediate difference in power.. I've installed the following upgrades to improve on response and hp:
k&n air filter
hyperboost bypass valve
aluminum hi-flow intercooler
hi-flow cat
3 inch downpipe
Stage 3 maptune ECU
3 inch intake
Of course this is only to improve power, but as mentioned earlier, I've also improved the handling of the car... no torque steer from the steering brace, neutral steering in corners came from installing a solid 7/8's inch rear roll bar, new disc and brakes, 17" wheels with wider tires.
Something that most of us might forget about, but really simple to do...is to replace our fuel filters around 80 - 100k miles. Regular maintenance is very important also. Simple things like that will improve fuel economy, and performance. Checking your plugs before you upgrade is also key.
Checking your plugs to see how your car is burning the fuel is generally a good indicator of other problems. Too rich, too lean, burning oil...should always be a concern before tampering with your ECU.
Good luck..
DC