At the moment the Engine is performing well, reliability is good. Maintenance is a piece of cake - Engine oil, Gear oil and 3 filters to change, good look around the engine. Plug in a laptop Carry out a ground run, a diagnostic check and download the data from the ECU's.
After sales from TAE is very good Markus and Mark are excellent.
Pity about para 6.0 tho Diesel Engines in aeroplanes
If you want to convert a 172 speak to Meridian they should give you all the info you need.