Yes, I got both my degrees from the OU, having messed up at brick uni.
Things are a bit different now to when I was in the OU. The fees were subsidised by the govt. and I got help from my County Council as I was a single mother.
Nowadays, it's as expensive as the fees that any other student at a brick uni would pay. However, my nephew is going to start an OU degree later this year, and has got a bursary from somewhere.
Anyway, it doesn't sound as if you're worried about the money side.
Go for it. You will get lots of support from tutors and fellow students. It's fun as well as hard work, and so worth it when you put that gown on at the end of it all. Good luck!