Ok i have a question about this. My brother and I bought the family pack, although he is eligible for the 9.95 upgrade. Now I know the family pack is good for 5 computers, but my question is; on those 5 computers (we only have 2 Macs), is it unlimited installs? The guy at the Apple store said the install disc embeds a serial or some number, rather that is true or not, I am not concerned. I am just concerned that if I want to reformat down the road, and i install SL now, will it count as another computer? The guy at the Apple Store seemed confused, which isn't surprising.. I have searched for this answer to no suffice.