Comparison between the Bryston 7BSST² and the Bryston 7B³

Although I have not personally heard the amps you ask about a friend demoed both and suggested that if one has the funds the new Bryston 7B³ are the way to go. She said (in your words) a better performance.

If you can't demo them for yourself, why don't you call a dealer and ask them to describe the difference in sound?

Bryston SST2 is already slightly smoother than the older versions. I have not heard the difference on a 7B but it was there on the popular 4B. I think you will be fine with either model - so cost may be the deciding factor.

Why do you need so much power? What speakers are you driving MBL?

Also check out the Benchmark ABH2 - the performance specifications are better than anything else on the market at any price.

Have a look at whitecamaross amp thread.  Based on his observations, the Bryston B3 series is much more laid back when compared to SST2 series.  The SST2 is going to be more forward sounding, probably with more attack and resolution.  It depends on what you're after.  I would concur that Bryston has had a change in its core sonic signature.