No rationalization about it just been hearing its the latest and greatest thing out right now.......Although if you have any input to what different (maybe cheaper) route I might want to take, Id be glad to listen
The TTS Mastertune IS the latest and greatest IMO for FI bikes. It offers the individual the power of tuning via the V-Tune mode for his particular build/components capable of tuning the bike to 90-95% efficacy in the range you as the rider actually ride the bike versus paying a dynotuner big money to get the last 5% out of the motor at WOT where none of us ride anyway. HOWEVER, it is a tuner that receives it's closed loop feedback from the 02 sensors, therefore, if you opt out of putting 02 sensors in your pipes it then becomes as useless as tits on a boar hog. It does require rider input during the tuning phase, but again, with each V-Tune session it "builds" the tune to YOUR specific engine demands and requirements. That, to me, is optimal.
http://www.mastertune.net/files/calibrations.aspHere is a link to the TTS website. I'd would recommend downloading the Mastertune tuning manual and giving it a read. It is found under "MANUALS".
PS....."cheaper" is not always better and for what we pay for these machines, I like OPTIMAL.

If you do not want to add the 02 sensors then get the PowerCommander.