I have the Lexicon/Bryston 501 monos on my B&W 800N's. I home auditioned the Mac 501's for 10 days against them in a diligent manner. I love the Mac appearance and resale value, but must say that I could not really ascertain any real difference in sound quality--it was a wash to my ears. Considering the price difference & unmatched Bryston warranty, unless cost is not an object, the Bryston wins easily in my humble opinion---Mac wins easily in the appearance category:-)
