I had the Power Commander V on my Yamaha V Star and it worked well. I use to get the maps emailed to me for the company I bought it from whenever I changed my setup. I now have the Vance & Hines FP3 on my Sportster and I like it a lot more. It works with my iPhone so I just go to the FP3 App and enter my setup and I get the maps sent right to my phone and from there I remap my ECM using the FP3. Also, you have the option to keep the FP3 plugged in, and if you do it will show engine info right on your phone in realtime while riding.