My Experience starting back in 2008 with a Mac Mini and later MacPro and Snow Leopard was largerly good, stable and reliable. Lion was ok but with Mountain Lion Things started to get buggy, slower and more frustrating. My Mac Mini, MacPro and Macbook Pro become more problamatic and unstable that started spending hours tryining to keep things working. Now with Mavericks I'm spending as much time and experncing more frustration then I ever did with Windows 7. Mavericks is so slow and clunkly it reminds of windows 98 however, and I don't consider it an 'upgrade' but an encumberence.
For example, Adobe says CS6 is comparable but even after the patches I find Most apps are so buggy and unstable as to be not useable.
So Bad has been my Mountain Lion and Mavericks experence the only way I see to work with the software I need (Photoshop, Dreamweaver, InDesign, Premiere and Office 2008) is to go back to Lion or Windows 7, At least Windows was mostly stable.
I used to enjoy using my MACs and found my productivity actually increased over a PC, but now I see no compelling reason to stick with Apple as it seems they are shooting themselves in the foot by praticing the Microsoft model of not only releasing buggy OS releases, but releases that make the software the expensive software you bought a year ago functionaly obsolete .
BTW, I did a fresh install of Mountain Lion, did all the updates and then did the Mavericks upgade on both my MACPro and Macbook Pro. Same issues on both machines but more issues with video on the Mac Pro.