I've always liked the programming on OETA. Ie it usually has a few programs that other PBS channels don't carry. I used to watch it all the time when it used to be DCII. However since they moved to DVB on AMC-21, I have a pretty hard time with it. I can generally pick up LPB 80-90% of the time, but I can only lock OETA about 50-60% of the time. Of course, right now, OETA is coming in stronger than LPB on my Diamond, but while I get error free signal for LPB on my TT3200 on LPB, I can't lock OETA with the 3200. So I'm not sure what the issue is with the OETA signal for me, perhaps footprint, but it seems to drift in and out more than LPB does. I wish they had kept it on AMC5.
EDIT: I'm one of those PBS junkies too, and tend to judge my TVRO success on the ability to find PBS programming (and also via my ability to find NFL games from one specific team, but that's another topic). It varies as things come and go, but I think now I'm seeing 20 different transponders on 6 different satellites with PBS channels. Some of those transponders have duplicated channels, but many of them also have multiple channels, so that's a tradeoff. Anyway, there is LOTS of PBS up there.