Value is the key for me
I only try to play Rebuy/Addon tournaments that are providing a good guarantee. For example, Bovada
runs $3.30 R&A with a 1K guarantee - I take the initial addon to double my stack size and then allow myself 2 rebuys. The two rebuys are either a bustout and double my stack again $6.60, or two single rebuys if I dip below the starting stack. These can be tricky fields because of the aggressiveness that is caused with rebuys and reckless players - so the first two orbits of any new table are critical to not making a bad play early in the tournament.
Hope this helps!