Yes, we have compared the two. Let's start by saying my comment of not event close was from that testing. The new Supertuner is a poorly done deal at best. The Smart tune only allows you to check a box to turn it on. You cannot set it up like you can with Mastertune. What you see on the screen is NOT what gets put into your ECM. There is no user interface with the Smart tune so you have no idea of what went on and why. You have no way to see if you have collected good data, bad data or how much of either. The new SESPT in no different than the last other than adding the new feature. You buy it and you get updates but has anyone tried to update the SESPT lately? How come those that have bought the tuner cannot get the Smart tune unless you buy a new version??? Mastertune get's update and ALL users get the updates! Mastertune is the only current product that allows you to make a backup copy of how your bike is before you start. Mastertune is the only current product that allows you to put it back to the original setup at any time. Mastertune allows you to calibrate your speedometer, Primary gearing, PE mode both spark and fuel and on and on and on that your cannot do with SESPT or any other tuner.
So in short Mastertune allows you to do a much better job tuning and calibrating. It allows you to see what is going on and change it. DataMaster which is included allows you to work and diagnosis your bike if you have issues. Vtune which is included shows you what is going on while making the calibration changes for you. This allows you to make the final decision and understand why your making it.
MSRP for Mastertune is $425.00 which includes the software
MSRP for SESPT is $459.95 which does NOT include software
Price you get from dealers can and will vary so to say the SESPT is cheaper is like pissing in the wind, some times you win and sometimes you do not. One thing for sure is your getting 1/2 the product when you buy the SESPT when compared to Mastertune.