The Sanyo z5 was built like a brick, but the PQ degraded over time. My polarizers (or something) are shot on it, it can still do bearably almost ok in really punchy scenes, but in the past year or so it developed a weird shadow reflection on the screen where white text on black has a shadow. I had 3 dust blobs over 15,000 hours, all easily removed with the blow holes.
I put 15,000+ hours on it, so I'm not complaining. Of course a lot of those hours were just leaving it running on the time and never turning it off (the Viewsonic Pro8200 took the Sanyo's place as my TV, the JVC is the movies, and my LCD TV is for decoration that never gets used). I am going to give it away to someone I know most likely, or sell it in the used market for $5k.