Ussualy the add on is good to be done if you are low stack and if the amount of chips provided by the add on is big enough ( in my opinion must be at least 10*big blind).
I always add on no matter my chip stack. its +ev to do so.
I uasully buy in at the add on break and then add on too cause i dont want to be outa the game before it actually starts and definatly dont want to rebuy more than once!I was wondering how many people buy add one in tournaments. Or do you skip buying the add on if you’re well off in chips or do you buy it just to add to your chips even if your well off?