TomMystery,
Brystons are very rugged and built to last for many years, although you kind of pay for the 20-year warranty up-front, given the Bryston prices.
Like JohnK, I really doubt that you'd hear any audible differences from your current gear. We (myself, other audio golden ears and Floyd E. Toole, did exhaustive double-blind comparisons of many solid-state power amps, including Brystons and even a big old Macintosh tube amp--it measured very flat--using musical material of all kinds and we did not detect audible differences as long as the amps were not driven into clipping).
Those tests were done 15 years ago or more, but nothing of consequence has changed in good solid-state design. Until someone demonstrates to me audible differences with music when all factors are controlled, I stand by our findings of those NRC tests.
Regards,
