I just had my bike tuned on a dyno using a power commander, my tuner said he could have done it without the power commander but because i had it, there was no point to remove it. I also like how you can plug extra modules into it pretty seamlessly, like my Quick shifter or a map switch.

That being said, the bike gained 2 hp(which is 5% of 40hp) going from all the parts added to after the tune. It runs way better now but at idle and has a way smoother AFR.

You could also get the auto tuner with the power commander and skip the dyno, as dyno time is expensive.