Mine is ALWAYS set correctly. Either when I pick it up, since it's a automatic, or set before I put it on (a nice app on my phone lets me know the exact phase). One of my biggest fears would be to wear it out and some one tell me that the phase is off by a quarter!It’s just a complication. I doubt most people who buy moonphase watches even set them
I don't know about your Ball, but my Omega is so precise, that only one days adjustment needs to be made every 10 years!I owned a Ball Moonphase, and did set it to coincide with the actual moonphases. It looked pretty cool, but it had no practical purpose. If you were a fisherman or a werewolf, you have much more accurate information on the internet than any watch could provide. Buy it if it looks nice. I sold mine simply because, as a moonphase, I considered it a "night" watch, and with Ball being one of the forerunners of tritium in the watch industry, it bothered me that my model didn't have tritium lume at most of the hour marks--only at 12, 3, 6 and 12. Would have kept it otherwise.