I think you should get yourself the AutoTune, you already should have ideal AFR set tablesfrom your dyno tune but if you change altitude the Auto Tune will readjust for the change in conditions, you also never need to go near dyno again unless you want to see ponys, I know your guy said not to bother but that probally because it would put him out of a job should you decide to make any other exhaust or mechanical changes as the Auto Tune will adapt your tune it doesn't care what you do it just follows the AFR tables you have set to give economy and power where you want it!!
I hear what your saying mate but i really dont need it as i dont intend to change anything else she is exactly the way i want her now and she is running perfectly
even when i take her up mt tambo or glorious ect she doesnt miss a beat
i really dont think its needed unless u intend to make more changes and i notice no negetive affects when i ride the mtns or ranges so ill just save myself the money for fuel i think
If i ever change anything else i will get one but i dont see that happening .
If anything i will be buying a second bike rather than changing this one i think she is done now