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yosemite has been, for me, the most stable OS since 10.6.8. am installing the 10.11 beta this weekend, so...will be interesting to compare. am expecting issues (this IS a beta), but looking forward to it to...
 
Again, like all have said, it may night be right for everyone but its made my 2010 MacBook Pro useable again for coding, some Adobe stuff and the Affinity apps are running like a dream. Overall, I'm really impressed.
 
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