There are 4 key things that interest me on these (or any similar) heaters:
1. Noise Levels
2. Electrical Consumption
3. Fuel Consumption
4. Heat Regulation
Not sure in your installation you will be able to directly check this, but for #4, how is the heater running controlled by a thermostat? Is there a sensor in the controller box with the rotary switch? Is there an external temp sensor you can plug in to perform this function.
This seems to be the biggest limitation for an Out-the-Box Eberspacher D2 install on a Camper/Motorhome, where you either have to rejig the wiring to use the controller temp sensor (if you have an 801), or fit the optional temp sensor (not included with the standard kit set). What is the Planar like in this respect?
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