When I looked into these units, the potential repair costs over time led me to choose a highly insulated electric (Rheem Marathon series). The major parts like

When I looked into these units, the potential repair costs over time led me to choose a highly insulated electric (Rheem Marathon series). The major parts like the compressor were not available through Grainger or even an HVAC supply store, nor could I get my hands on a retail parts price list. So I had concerns over vendor lock-in, and the initial capital premium would get vastly inflated in opex costs over time. Has anyone had 7+ years experience with these, and if so, can you please share your ownership experience and the model & brand you used?