There was an excellent post on another site on how to play
pokerstars rebuy tourneys. I do the occasional rebuy albeit it is not my favorite tourney type. I try to get thru the rebuy period without having to rebuy. I will take the addon however. I did rebuy once when I accidently hit the allin key when my screen jumped and I made the wrong move. All was good as I went on to cash and get way more then my outlay.
Realistically in some of the bigger tourneys you have to be willing to rebuy at least once or twice and do the add-on. If you are not willing to do so then you might as well play a freezeout.
Ive won tokens to some of the guarantee tourneys on
Titan that are rebuys. I have gotten close to the money without rebuying for the $30 or $50 extra but in the end tight play during the rebuy period to avoid the aggressiveness of those rebuyind didnt allow me to get a big enough stack to be able to maneuver and cash.