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I own a 2008 15" MBP. I didn't want to upgrade from Snow Leopard - there seemed to be a synergy between SL and my hardware.

Even for free, I'm weary of upgrading my OS. Too scared to take a performance hit.

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Recent releases of OS X, and probably this latest one too, have focused a lot on actually improving the efficiency of the OS. Can't know for sure w/o trying it, but I'd expect to get a performance improvement from the upgrade.

Initial reports from the GM tell of many improvements, especially the memory subsystem which aside from the possibly gimmicky memory compression finally stopped sucking and swapping for no reason because it couldn't handle its own caches correctly. Users on even high-RAM configurations (16~32GB) which would still end up swapping in previous versions due to memleaks and memory mismanagement report 0 swapping.

I love SL and I was really hesitant to upgrade to Lion. When I did, it was weird but I got over it. Lion and ML feel so much faster.

I'm just worried that I'll be upgrading for eye-candy rather than increased power usability.

Reading the review has convinced me to try it. I'll backup SL and download Mavericks next week!

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