Yeah! it is easy to use............but kinda of frustrating to understand on what settings to make. You would think they would have had aftermarket pipes or air filters downloaded in this powertuner so when you made an aftermarket change to the bike...... They would have a map already set for these changes ... correct me if I'm wrong but this PT will seem to be a valuable tool it is just understanding it first. First, Yamaha is never going to go around researching everyone's aftermarket exhausts, etc., to try and find an ideal map for every conceivable combination of mods, weather, and track surfaces any more than they offered jetting specs for the current models. I doubt you'll even see maps for GYT-R products, or that they would really be helpful if produced. Second, a Twin-Air has no effect on jetting on an '06, and I don't expect it will on a '10, either. The assumption that an aftermarket exhaust automatically requires rejetting is also flawed. My '06's required no jetting changes for the DRD systems I put on them. The difficulty some people are going to have comes from the fact that they have been used to changing either the main or the pilot, or both, and letting the needle take care of itself, which, to a degree, it will, since it basically just modifies the fuel flow through the main jet. With the EFI, they will have to actually tweak mid throttle as well as full throttle if it's a problem. Timing changes will be a little more difficult to get used to, since very few people have had any experience with altering it, much less being able to tailor the mapping. Take the time to analyze the bike's performance, and how you need or want to change it. Make the changes in small increments, take notes, and don't make jetting and timing changes at the same time, at least not at first, so that you can be sure of the effect you observe from each change. Pay attention, think, and you'll figure it out.