[mythtv-users] MythTV vs Tivo and DVR

[hondaman]

It seems a lot of people are using standalone boxes these days, Tivo or 
DVR.  Can anyone explain how these work?  Are people watching recorded 
TV when watching live TV, such as MythTV does?  The reason I'm asking is 
with MythTV, there is a noticeable degradation in picture quality while 
watching live TV.  Do the Tivo/DVR people experience this same quality 
issue?