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I didn't notice anything significant when I upgraded. If Leopard is just fine, then stick with it, Snow Leo doesn't provide anything crucial, just some minor upgrades
 
I find Snow Leopard to be on par with Tiger in terms of speed (I found Leopard to be very bloated), it's only what $29? I'd say it's cheap enough to upgrade...
 
I'd say it's a cheap enough upgrade really. I can't think of any big cons you would have, but a definite plus would be that you'll keep getting more updated than leopard. But that's about it really
 
I didn't notice anything significant when I upgraded. If Leopard is just fine, then stick with it, Snow Leo doesn't provide anything crucial, just some minor upgrades

Do you get 6gb of storage back on your hd? I heard this but was not sure.
 
I gained 7 Gb after upgrading, searches in Finder are a lot quicker in SL and my system shut down/booted lightning fast after the upgrade. I have to say that the fast boot/shutdown only lasted a week or so, things have slowed down since.
 
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