Not owning a Mac but only used one in passing or at a friends house, I never really saw anything amazing about the OS, dont get me wrong its feels like a very fast, stable OS, but like a few echo it is a little to restricted in what you want to do, I'd image if i own a Mac I would tweak a lot of the setting and feature to suit me more and its good thing to see that their is a lot more you can do to customise OSX than in the past.
I recommend a MAC to any Computer newbie as it is a simple OS to get to grips with than the competition. But it just not for me.
The thing that I find more fun and interesting on the macs is not the OS but the iLife sweep of application I wish there was something that worked as well and as together on amigaos, linux or windows. That makes me want to own a mac more than anything.
Plus also although their aluminium designs are pretty cool, specially on there laptops I do wish they still did the imac g4, I really did like the look of that computer and keep thinking I should get one, there only like £100 on ebay now a days, but just don't have the room for it.