I have installed several hundred WaterFurnace systems, commercial and residential. A few have had mechanical problems but the factory has always stood behind them. You can ruin any brand of heat pump with a poor duct design and poor loop design, most of the time its not the equipment's fault.
Bullbob, heat pumps don't make heat, they move it. So if you need rapid warm up use aux/emergancy heat or don't set back your thermostat as much. Just a thought.