If you need a transponder too, I put the Appareo in my Cessna 140 and one was already installed in my Mooney when I got it, I love the model. I think its greatest advantage is having the stratus 3i paired with it, its just like the portable stratus that most are familiar with, but it just happens to have a charging port, and connection to transponders antenna, on the transponder for it. So it can be mounted somewhere behind the panel, as it uses the transponders antenna for the "in". This means you have an "in" with ADSB that comes on the minute you turn your transponder on for an iPad or whatnot. For a fraction of the cost of an "out and in" panel setup for those of us that are never going to have a panel mounted GPS display. I think that 5k mark is probably pretty reasonable to estimate, my install was a while back but I think that is probably a pretty accurate guess.