The thing we (especailly DH) likes best about the heat pump is that with all the rebates it's $900, so much cheaper than the other options.
That was one of the main reasons we went for it. DH just went looking one day for the continuous flow units and was told about the heat pumps with the rebate. He did some research and the model (Stebel??) we got it meant to be one of the best, theoretically meant to only cost about $100 per year.