I've had the 7700 for a year now..Great amp but you need to be in shape to lift it...its a brute. I'm running Snell AII mains with definnitive tech surrounds. I have it paired with a onkyo PR-sr5507 preamp/processor. I was a little worried about heat since I have it in a rather tight enclosure but it has not once had a problem and surprizingly it doesn't get that hot.