I'm the owner 3 of these units, transport is built like a tank and used exclusively as that for movable Media(with external DACs) they have proven to be more than a good investment. I used to be a Service Manager/Tech at a west coast High-End HiFi Store so I got Sony (as well as many other Mfr's) Service Training and Certifications which has been more that beneficial to say the lease. Maintaining the units is a must! I've stood these units up to trials against units much more expensive and the s9000 ES hands down out preformed. I know these units won't last forever and at my age my hearing is rolling off at ~17Khz or so, for the age of the units, I'd say they were well worth the investment!