I really enjoy the PVR capabilities of this unit and the picture quality is way better than my old 4000. The digital audio may even be better with this unit but I'm temporarily using another receiver so it's difficult to tell. The free PVR and improved video quality make this a nice upgrade. Also, the included RF remote is a must for me. I do wish that they included a coaxial digital audio output - I dread adding yet another converter box to my system. The faster guide on the 501 is a real plus. The searchable 9 day guide stored on the drive will be a great addition when the upgrade is available. Hopefully this is extended to the Themes as well. Now to the strange symptoms I have seen. 1) The yellow stripe. Only have seen this once. Lasted for a few seconds and then pixelated away. Not too annoying but it had me wondering. 2) No video, but guide is operable. I've seen this crop up a few times and happens after setting PVR timers. Turning the unit off and on via the remote makes it well again. 3) PTV button won't show me the Recorded Events listing. I get the info screen on the top instead. Happened to me today after using a PVR timer to record "The Big Red One" I have to reiterate that I really like the 501. I'm just wondering if these are software bugs related to the PVR features or if my unit is faulty. I'd be pleased to hear any feedback from other owners.