Mastersound 300B Monoblocks

Just wondering whether there are members familiar with the Mastersound 300B monoblocks. They seem somewhat costly at $17,000 retail compared to other 300B monoblocks. I am told that Mastersound, although not that terribly well known in the US, is regarded as ultra Reference in Europe, with their transformers second to none. Just curious, as the 30 Wpc they offer per monoblock could allow the use of a variety of excellent loudspeakers. Thanks in advance for your responses.