Here's an example: I ran a Sundown 125.2 on some Eminence Alpha 6a midrange drivers, played well and got warm when abused. I ran the same exact setup on an MB Quart 2150 I believe it was the model number (basically the amps had around the same specs power wise). In my car and my application both played well and sounded the exact same but my MB Quart got hotter than the Sundown far more hotter, all settings set the same (used DMM to set up). I was abusing full tilt everywhere I went all day even on long drives to neighboring cities. The only facts I have to justify why I should spend the extra $100 on my Sundown is because of where I live (Texas, hot climates) and my listening habits. If I played the amp barely and didnt go full tilt all day then the MB Quart would do fine in an average user's setup. So should I recommend the Sundown to the average user because he doesnt play his music like me or doesnt have the same listening habits, no but if price werent a factor I would. Overall it is too many factors to throw into play when doing a this vs that thread without hands on testing.