Since we are talking about various brands and their features, I want to throw out one more piece of information regarding the Dynon Skyview (it may also be true of the D180) that I found extremely helpful. When you purchase the Dynon EMS (engine monitoring system) module you should also purchase their package of engine sensors for your particular engine, in my case the Rotax 912. Then when you go to turn the system on and set everything up, the setup menu lets you tell it you have the Rotax 912 and the appropriate sensors and it then automatically configures most all the sensor readouts, ranges, red-yellow-green ranges and warnings. There is very little you have to do to configure the whole setup except choose the type, size and location of the readout widgets on your screen. I know Advanced Flight Systems (owned by Dynon) also does this and very likely some of the other brands. For me, not being very electrically inclined and not highly computer savvy, it was a tremendous help and confidence builder. As Eddie said, the more you stay with one brand of add-on modules the easier it is to get everything to work together. It probably is not the cheapest way to go, but I have a hunch it will make life much easier for downstream support and troubleshooting.