I have the Magnus MA-300, and it is an outstanding amp that replaced a Burmester 911 MK3 and a Hegel H4SE. I am upgrading my cap board to the new MA-500 board. Canary/ Magnus Audio does not advertise, hence very few reviews. However, there will be a very good review from Dagogo very soon. I can't recommend Magnus more highly. I am a customer not a dealer.