ReplayTV RTV5516 160-Hour Digital Video Recorder
Better than Tivo, but not as good as previous ReplayTVs
ReplayTV is great and has features that Tivo does not.  But be careful -- many of the reviews refer to Commercial Advance (automatically skipping commercials) and Internet Video Sharing (ability to sent recorded programs to others via the internet) which are not available on current the 55XX series (5504, 5508, etc.).  These features, and great features they are, are only available on the otherwise identical 50XX series units (5040, 5080, etc.).  Commercial Advance and Internet Video Sharing are also available on the 45XX series units (4504, 4508, etc.).