That is how I feel after installing 10.9 on my almost 3 y.o. 13" MBP!!! Battery life is literally doubled, the fans rarely kick in, the bottom of the case remains cool most of the time. And everything feels zippier. IMHO, this is the best OS upgrade I have ever seen! Thank you Apple!
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- Thread starter prism
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For me, I had Snow Leopard on my MBP when I got it...Lion took away battery life, Mtn Lion did not improve, and also used up RAM in such a way as to get my processor spinning the fan up way too often, apps crashing, etc...so, now, I am very happy, so far, with Mavericks handling of memory is much, much, much improved, it is running cooler, everything is faster and smoother, but, haven't had a chance to try out battery life yet...so far, though, seems like back to snow leopard speed, maybe even stability, and new features too
...so for me, more of a "restoration" than a new computer....and I usually wait for 10.x.3 update to go for the upgrade...but I'd read good things about Mavericks on here, and then it was free, so I got it within 24 hours of release.