Actually from what I understand since Lenbrook industries bought out the other owners (NAD was had several owners at one point) in 2001 reliability and quality have gone up. Their new offerings in the 2 channel area (classic series) are very nice. I have only heard of one instance of someone having and issue with an M3, that is one nice integrated. NAD has it's own factories in China, so you have critical oversight. So NAD designs it's gear in Canada and then builds it in it's factories in China. Nad was one of the first companies to design in the west and assemble in the east. Things are much different from the days when you dropped off your designs to an OEM and they did their work. I would buy the M3 with confidence and compare it's build quality and sound to amps in it's price range.
NAD Reliability
There seems to be a global pressure to push out new electronics at ever increasing rate with most of the production being done in low cost Asian countries specially China. NAD always has been a high value company making musical components at a fraction of most of the competition. I was on the band wagon in 1979 to purchase their musical integrated classic. It seemed to last forever till giving up the ghost in this century as part of 3rd system. However, I have heard rumors that their most modern offerings are suffering less quality control and/or lower reliability. Specifically has anyone had reliability problems with their flagship M3 Integrated and if so were you satisfied with service quality and cost?