I upgraded from Leopard to Snow Leopard without much issue. As expected, the installation was quick and painless. Apple advertised the install would use 6GB less space than Leopard. Much to my surprise, the install freed up 45Gb of space.
Too good to be true? Possibly, I’ve done a few upgrades starting with Tiger so it’s hard to say if they dropped applications or cleaned the mess left in the wake of the upgrade.
Possibly too good to be true. Snow Leopard uses hard drive vendor gigabytes, while previous versions had used power of two gigabytes. If you were looking at free space, this could account for it.
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