I have had fieldstar installed on three different combines and have found the tech support to be great. The upgrades are also provided free of charge with the system. If callabrated correctly, it is very accurate. You have options, bars or numbers, on the display screen for how you want the information displayed. I also use the fieldstar on my white planter to variable rate while planting. Depending upon the year of the combine, some years are pre-wired for the fieldstar which makes installation very easy. This is also very user friendly.There is a difference between the older systems and the newer systems(more information options) ie, fuel consumption per hour and engine temperature. I will be receiving the light bar system soon. Feel free to e-mail me if you have any further questions (heitz@ohiolink.net). let us know which one you decide to go with.