Qestion asking guy.....anyone use one of these?

http://www.granatellimotorsports.com...50111small.jpg

If you do, give me some insight....Do they work?

Are they worth the $250-300?

Someone bought one and tried it... and it threw codes. Not sure if it was "installed" correctly (as you'd think it would be a no-brainer).

So, basically what I'm saying is... no one is truely sure one way or another.

Jay my brutha, be the sacrificial lamb and tell us all if it works!!!:D