I did this in June 2007. It was really marred by the fact that my beloved kitty was really really sick right at this time and died shortly after I finished my program. I didn’t really believe that I had actually graduated until I got my diploma in the mail.
It was worth it in the sense that it helped me get a job that I wanted in a field that is interesting to me, but the experience itself was pretty unpleasant. I spent a lot of time taking required classes, was unable to get into a lot of electives because I was neither a PhD student nor an undergrad, and ended up pursuing courses that were available rather than necessarily those that were interesting to me.