You might want to consider calling Audio Advisor (800-942-0220) located in Michigan and speak with them. They carry the Bryston line and could possibly answer your questions in a non biased manner. In the past, I have done that and found it very helpful, when I did not receive answers here on the forums.
Bryston 4B 3 Cubed Amp
Still looking for a new amp, decided against the Magtech. I am interested in hearing from anyone who has heard or has experience with this amp. I am only interested in this particular Bryston amp, not their other ones or any other brand at the moment.