I've recently got into Sit and Go's and have been doing alright with them, making some deep runs. Yesterday I registered for a $3.50 + Rebuys event for the first time but it struck me that I didn't know any strategy about when to use a rebuy. Some players used it straight away, others re-bought as soon as they were busted, while others simply chose not to re-buy if they lost their chips.
Where can I find some knowledge about how to decide when or whether to rebuy in events like this?