His map is NO better for "your" bike than a provided map by dynojet or any other member who has a map made with the same mods as you. Each bike (motor) is unique. Some maps will work better than other, some will work better upper rpm, some lower.....but his will not fit your bike like it fit the bike it was made for.
If he has you suckered into that thinking, go buy it from him.
Never said i was an expert tuner, but do know what im doing adjusting the FI, and carbs and working with a dyno. A good friend owns a business with one and i have played with it a LOT.