I don't transcode, so the entire (unstripped) program is always there for me to view. But the commercial stripping in MythTV 0.20 (old version that I run) is VERY GOOD.

It generally only screws up at the end of every single HD program from CBC. CBC has a nasty habit of removing their onscreen logo for the final program segment before the end. This causes Myth to think that the last break continues through the final segment.

Other than that, it's pretty much flawless here.

Cheers