Hi, I'm looking to upgrade my old Denon AVR-600RD ProLogic receiver this year. One of the candidates I've considered is NAD. However, some people seem to have experienced quality issues with NAD receivers in the past, but how does it look these days? Is NAD generally considered a more unreliable brand than, say, Denon or Yamaha? How is the physical build quality (buttons, switches, dials etc.) compared to Denon (which I know)? Thanks.