JimF
First follow HD-Dude's advise. There is a lot of information in that thread.
Second, what I did was research my area for shops with Dyno-Jet machines. None of the dealers in my location have them. I went to several and asked questions about the race tuner and power commander since I had narrowed down my selection to those two options. I first found that the race tuner was difficult for many tuners to set up due to the number of points to adjust and the time it takes. Most start with a base map and just work out a few of the points and charge you for the estimated 6-8 hours of time. I found a shop here that kept a binder on all the bikes tuned on their Dyno. While talking, I flipped through the binder and looked at different set ups, torque tunes, HP tunes A/F lines, etc. I figured that they were pretty proud of their work to allow me to examine the binder. (probably 300 plus print outs) They recommended to me the Power Commander because there are probably more shops in the country that can work with it than the race tuner. Since I like road trips, that appealed to me. I'm not saying it is better, because a good tune on the RT would be smoother across the RPM range. I selected my tuner on the above information and because he invited me to bring my lunch and he would let me watch the work being done on my bike. (I also brought my shooting earphones cuz it is loud)
If you find a tuner who is proud of his work, take his time to explain the process, and let you be there for the runs, you probably will get your monies worth. My numbers are on the SEEG page. We even ran the dyno through acceleration test and twisted it to the limiter in the sixth gear. There is a chart of this showing 165 MPH at the limiter. That is the only time I will ever see it go that fast unless a bear gets on my a$$ in Yellowstone next week.
Crawdaddy