I went with HPtuners, I had my mind set on EFILive.
only reason I went with HP tuners, is because I went halves on it,my buddy has a GTO, Efilive live dont support GTOs. so HPTuners it was for me.
my first mod was a short shifter, second mod HPTuners
I havent done any tuning yet because i havent installed my wideband, but did couple logs, tryin to get familiar with the program. its fairly simple to use, it has description of what every setting can do. and the forums covers alot of the newb stuff