Are you sure it's not your network? What are the symptoms you are seeing?
As I said before, almost all of the problems I've had with the linksys is related to network. Try hard wiring directly from the router and work from there. Make sure the pc is connected by wire too.
Alternatively an old laptop can share the recorded tv as long as it has w7 and it isn't protected content.
As far as Tivo goes, it just works. I never get a bsod or crash like I used to get with the SA 8300. I needed the MC pc to act as a backup dvr in case my wife's shows did not record. On top of that, they have added so many features to it that I only change inputs for BD playback or for hi res plex playback. The plex client is not that great. It has netflix, amazon, tablet playback, and lots more that I don't use.