I would be curious just where you heard that AVA "build quality" is lacking.
AVA units are hand made by skilled technicians here in Minnesota who work for me because they enjoy what they are doing. We are very demanding to achieve perfect build quality on each unit out of our shop. I have been building quality audio equipment for the past 50 years and have never had a reasonable build quality complaint. No, we don't use magic parts or audiophlake wires or connectors, but our units are put together to last for years and years.
I have no issues with anyone at AC who has done reasonable listening comparisons between a current AVA amp and a comparable McCormack amp in power and reports that he likes the McCormack better.
However cheep shots about rumored "build quality" from someone who is reporting second hand anonymous information is simply not treating us or AC readers fairly.
Regards,
Frank Van Alstine