I had 7BSTs for a time with a pair of CS7s. This sounded good for a couple of years. The key is not to crank it to loudly, I did one day and blew out the high end driver in the coaxial high/high mid unit (which Thiel replaced free of charge). The Brystons just didn't have the current delivery capacity to avoid going squarewave at high levels.
As long as you don't have unrealistic loudness expectations, the Brystons will do just fine.
As long as you don't have unrealistic loudness expectations, the Brystons will do just fine.