Ou school had three people doing it, and half the time one of the guys was away, so our class was almost a one-on-one tuition anyway lol.
But yeh, if you wanna do four unit, correspondance isn't that much of an issue. Just try not to get annoyed with it. A couple of my freinds have done correspondance subjects and they get to halfway through the year and then decide they don't like it anymore because it's not in a class or anything. Then they just don't try anymore and they end up doing so much shitter than they could of.
Anyway, moral of the story is, correspondance is cool if you do the work. If you bludge it off you are really going to go shit.