[Custom 68]

I have it and have the pro version. I wanted to easily hook up my wide band. My tuner offered lots of free tunes for me as I swapped things around however I always had to pay shipping back and forth. Plus my computer was somewhat burried so it was tough to get to. I bought it thru him and he sent me a new pcm unlocked and we could e-mail tunes back and forth.
It became necessary for me when I went turbo, it became tough to get it just right thru the mail. It did cost me extra credits since I went to a 2 bar tune. Anyway with the version like said you can really do 3 vehicles with it. I was able to tune my buddies and get his stuff turned off when he did the swap he kicked in for the credits plus a bit to help. It is fun and you will spend tons of time researching. I tuned my tahoe It helped as it runs great but I was hoping for better MPG but didnt help.