I am someone who historically is a PC stalwart, since my parents bought a Compaq Presario in 1995, and as time goes on, finding myself gaming less and less on the PC, and getting frustrated at the power it uses etc, as well as the abundance of wiring everywhere.
I got a MBA 2013 recently which I loved (last time I tried a switch was 2006 with a MB but I must admit I hated it as it overheated constantly and never got with the OS). The MBA is the best laptop I have ever used. It is simply astonishing and carrying it around is oblivious.
Been feeling for a while I needed to rid of the PC and replace with an AIO, of which I looked at the XPS 27 and the iMac 27". As much as I have loved Windows, for my uses at the moment (Media, internet, VPNing into work when I work from home and general controlling stuff in the flat like heating and Sonos), the Macs are far cleaner to use than a PC. I also toyed around with the idea of getting a 27" display and docking the MBA with it, but the faff of swapping out will annoy me.
I went with the iMac which arrives in the next week or so (upgraded to i7, 256gb SSD and 780M). I am surprised as I do not feel any regret at moving away.
In ways you could argue Apple are not going backwards but "plateuing", but if you are anything but a gamer, I would certainly advocate now to go Mac route.
That said my phone remains Android (I am not keen on the iPhones as yet), but tablet is iPad. One area I think Apple need to up the game on is phones personally.
As your job and life become busy, you need items that just "work"; yes PCs are much better now at that, but time and time again there are instances that frustrate.
I also find myself more of a casual gamer, and this consoles/iPad gaming is adequate for me. I don't find the time anymore to spend hours on a game.
It's expensive (MBA and iMac not too far off £2,900), but I am sure they will offer me years of good use. I am not a power user anymore, and good looks are vital, especially when you are house proud and minimalist with decor.