I did the OU LLB course the very first year it came out. Was in my mid/late twenties at the time, with only high school education and still no idea what I wanted to do career-wise (was doing fairly lowly office jobs until then).
Cannot even remember why I chose law (was initially wanting to do something arts-based, although looking back, I don't think I would have progressed very much career-wise) I generally found it a slog, and pretty isolating (this was just before the internet was widely-used and so little contact with other students)
While I was studying, I got a job in IT, working for a law firm (on the basis that I had some legal knowledge and they could train me in the IT bit!). Fast forward a few years, I am now very experienced and freelancing, and while I find my legal knowledge useful now and again, I certainly don't need it for my job. Some people have said it was all for nothing, but it did give me a lot of self-confidence, and the fact that I was studying seemed to open an incredible amount of doors.
Of course, people do degrees for different reasons - it doesn't have to be about getting you a good job - for me, it was about feeling capable, realising potential and also being able to earn a decent living. If I was to return to education now (unlikely!) and I would probably do something more related to my own interests.
DP is Oxbridge-educated and (jokingly) likes to sneer at my degree now and again, but I know who worked hardest, and who is the most successful career-wise now!!!