Here is one item that doesn't seem to be consistent.
Assume you use the WEB app (because the non-WEB apps displayed inconsistent/incorrect data for a number on releases).
1) If you have an original unit and a 1 gig disk and zero recordings, on the setting page in the area where the hard drive information appears, it indicates above the used space indicator 1000 GB and on the right 984.48. Available 984.48. If you record 50 episodes and delete them all it still reports available as 984.48.
2) For a new model dual using the internal disk - fresh install - the same information is 64 GB - 58.78 and 58.71 available. Now one would think that any tester would say wow that's strange.