I got the sense that it'll quit after a couple years or so in, seeing them frequently for sale online for Parts. The original, non-Drop THX amp (forget the model number? with the digital display, I rarely see for sale used, and people still pay a good amount for it - little doubt that it's built better.

But there are other amps in the similar price range that have a noise floor nearly as low, and inaudible in any case, you might check out. Topping, SMSL?