On a CD player because it incorporates moving parts, I'd be looking for 8-10 years in moderate usage because after all, they are using only the finest components available, you understand. Otherwise, we'd all be getting our gear at Wally-Mart for $99.97 wouldn't we. In a solid state piece like a power amp, I don't think it's unreasonable to expect a much longer service life although many members of Audio Circle switch up gear much sooner. I'm not so much about the gear as about the music so I don't flip gear constantly.
D.