I had my units installed in Oct 2013. Ran them exclusively last winter with my oil heat system totally off. We were extremely pleased with results and saved money overall, but maybe not as much as some since my house was very efficient. That said, this winter we have done the reverse....turned off the Mitsubishi's entirely unless we go up for a few days when we can adjust the inside temp higher using the mini-splits from our laptop before we get there. With the 27% increase in electric rates and the very large drop in oil prices, we are substantially money ahead using oil this winter so far. We had zero issues with the Mitsubishi's....it was just an economic decision since the prices of oil and electricity were going in opposite directions. I suspect in future years this will not be the case, but we will revisit it each year. My Mitsubishi system is a 36K BTU system and does not have the hyper heat, as it was not available in the 36K BTU system and the wife did not want two outside units.
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