I have the R15 Directv receiver which is generally a good receiever except one issue that is pretty major ---  when using both tuners you cannot switch from one tuner to the other like the Tivo receivers.  Also you can do a channel switch, but you can't use the 90 minute rewind feature, in other words you lose the buffer.  Does anyone know if the software patch that Directv  talk about is out or coming soon --- or does anyone know how to get around this dual tuner issue???