It has been a life saver for me. I find in my case, it's best when paired with at least one on campus class. The online courses help because I don't always like being in public around people (during depressive episodes), the on campus one helps because sometimes, I need to be around people. It prevents me from isolating myself completely. Gives me incentive to leave the house. I take more online courses than on campus. Four courses a semester, one on campus and three online.

If you are good at managing time, they're great. There is still some level of interacting with classmates. Most classes require you to post on a discussion board and interact with the other students at least once per module (a module being 1-3 weeks long, depending on the course). You still have to meet deadlines. You can't exactly do things on your own time. When they say that, they mean at your own hour. Daily and weekly deadlines are still crucial. If you procrastinate, I do not recommend it at all.