Another upside to HPT - a TON of other vehicles are supported - all GM LSx stuff, lots of other GM four and six cylinder cars, growing support for Ford modular platform - so if you buy something else in the future, there's a good chance that HPT will work with it.
If you have friends with supported vehicles, you can help them out with HPT too. It's really versatile. I've tuned everything from an L67 swapped '55 Chevy truck to an L36 powered dirt track car to a stock '05 Mustang GT with it.
Honestly, too, I've tuned with a couple different packages over the years (twEECer for FORD EEC PCMs, DHP for 3800, extensive use of SCT Advantage III for modular Ford, extensive use of HPT for GM, and limited use of some import and other tuning software), and I believe that HPT is the best software out there. It's very well put together, easy to learn, easy to use, etc.
