Here’s the problem- Unless you have used the other three tuners , you really don’t have anything other than stock tuning to compare to.
That is very true. And hard metrics such as dyno graphs, 0-60 times, and MPG can't show or explain all that good reflashing does (or doesn't do). Lots of extremely relevant things are subjective like that, though.
It is a shame the tuners all don't offer deep discounts to reflash those who already have one of their competitor's products, since most people (me included) have a hard time justifying the price/risk a second flash (much less a third time) and thus are likely to never become their customer, anyway. It would be a good industry for that model, since the ACTUAL flashing costs very little (the labor, shipping, and liability is small, it is the research and development that cost so much and need to be covered.... a lot like medications, books, movies, music). And doing so shows extreme confidence, since it will foster more reviews from people who really CAN compare stock to A and to B (and/or to C).
I think it would be very difficult to "quantify" the effectiveness of a flash. But if I had to just GUESS, I would say most any reflash will give you that 70-80% of "greatness." Which is why I strongly encourage ANY Concours owner to reflash- whatever product they choose is almost a certain huge positive. And I think the value of that is easily in the $300 range. But if seeking that last 20 to 30% and you are already at that 70-80% level, the value can't be in the $300 range ADDITIONAL anymore, at least not for many or perhaps most people. It is like spending $30 on an HD Bluray of a good movie and then being asked to fork out another $30 to buy a 4K Bluray of the same movie a few years later. (Someone the other day called me the "King of analogies"
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Competition is great, though! I really hope that if/when I ever do get a different bike (or next generation of Concours, if ever one happens), such a vibrant market for reflashing exists, because I just can't imagine being stuck with lackluster and non-linear performance and/or non-responsiveness and/or non-smoothness on any motorcycle at this point. And given the restrictions and compromises the bike manufacturers must make, I have no doubt that most, if not all, models will continue to be hobbled in one way or another.
Anyway, to the OP (original poster): Congrats on the jump and do keep us updated!