I installed a KMD 150 in my RV-8 when I built it and have been very happy with it. It is very easy to use, the display shows up well in bright light, it drives the autopilot, and it is easy to install with its own built in cooling fan. Also, the unit is pretty short which is nice in the 8's instrument panel, where there isn't much room for long radios. If you are not going to fly IFR ,I would rather have this unit than a Garmin 430 because of the size of the display.