Hi. I replaced my Classe Omega amp last year with Topaz monos & have not looked back. They easily powered my SF Amatis & are fantastic with my Acapella LaCampanellas. I think so much of them that I just dumped my ARC Ref II Mk II to buy either the Pearl or Opal from Wyetech directly. I've never heard one of their preamps but based on the Topaz's & the few reviews I've read, I'm jumping in. I think it's interesting to note that the reviews have been unanimous in their praise for a company that doesn't spend a dime on advertising.