I bought it local for msrp. I have not had any hum or buzz issues. I did have some radio bleed through my cheap sub cable, switching the polarity of the sub stopped the bleed for some reason...people say that that is not the receivers fault. With the Ascends I probably don't need as much power as the 753, probably would have been just as happy with the 743 and saved 300 dollars...but I wouldn't trade my NAD...highly recommended.