Just because it is SVN, doesn't mean it is real buggy. It usually just has more support for newer items. I run DVB-S in the US, and Myth-0.20 doesn't have a lot of the support needed for that. Especially when it comes to over the air guide data etc. That is why I run SVN. To get better support of that. And the version of Myth on LinuxMCE is still the packaged Myth. I don't believe it is anything special just for LinuxMCE, don't quote me on that, due to the fact I haven't had time to watch to see where it grabs libmyth from heh, but pretty sure it comes from normal sources. What they are doing is running a plugin on top of that to integrate with it. Which is the same plugin I will be using with it if I have time to compile a new version. I will post my success or failures when I get the time.
As far as the DVB Drivers, the kernel drivers will probably suit just fine, they just won't be as new. But being as LinuxMCE is using a fairly current kernel, it should be fine, I will just have to put in the modules the settings to properly load the dvb drivers. That isn't a problem. If I was using some of the other DVB-S type cards, the reason for using the HG Drivers, is due to better firmware support etc for sync issues. But I am not using those type of cards, so it isn't as much a problem. But that is why you would remove the dvb support in the kernel itself due to the HG Drivers taking over that. And it compiles its modules against the kernel.
Thanks everyone for chiming in.