I'd like to add my recent experience. This was my first exposure to MythTV & MythBuntu, but I'm an experienced Ubuntu user.
I just build myself a dual core AMD X2 3Ghz HTPC with HVR-1600 tuner this past week.
So I figured... Ah! 9.10 is almost here and MythTV 0.22 has some config changes so I might as well use the "new" Mythbuntu 9.10 beta using 0.22 MythTV and avoid having to migrate to 0.22 later.
I can state that if you've never setup MythTV before, do NOT use 0.22, stick with tried & tested 0.21
In short, Nothing worked! Lol Well, almost nothing. My HDMI to TV did work, but thats it.
I couldn't get the remote to work at all, the new channel scan found no digital channels and the analog scan stays stuck at ch2, and doesn't move so found nothing there again. DVD playback was buggy, at best.
Not a great start when everything is new and you don't know if the problem is hardware or software.
So I installed XP, drivers & WinTV soft and everything worked.
I then wiped 9.10 and installed Mythbuntu 9.04 and almost everything worked right away, once I setup the card of course.
Remote works, Analog & digital scan worked. Recording & pause Live-TV worked.
The only thing I'm left working on is digital sound via HDMI to my TV. But I'm sure it's just some ALSA/Pulse Audio or Mixer problem that I will get fixed soon enough.
Oh, and xubuntu tools suck. I just want to mention that.
It makes it hard to debug not having the usual ubuntu tools around. I know it's lightweight but, c'mon.
Anyway, I'm enjoying my new HTPC MythTV 0.21 setup.
I think I'll be sticking with 0.21 for a while. I don't think I'll have the patience any time soon to work on 0.22 again.