It would depend on the waters you are sailing. If you are more than 200 NM from shore, you cannot count on anyone to get to you in less than 48 hours. Can you survive more than two days in the waters you are sailing in? If yes, ok. If not - doesn't do anything for you.I agree about the jackline setup, but the MOB AIS w/DSC could be beneficial even far offshore. Assuming you had a PLB or other device (inReach mini) that could get a rescue headed your way, the coordinates may be stale by the time they arrive. The MOB AIS would give a more updated location, which could be especially useful at night. If I went overboard solo I believe I would deactivate the MOB1 after an hour or so, and reactivate it when I saw/heard a ship or search aircraft.
dj