I use both iMac and PC at home. I know nothing about either, and don't push them hard, but at, say, £20 per hour, the cost of wasted time while the PC was down and awaiting attention would have bought three of these aluminium and glass iMacs by now.
I've disconnected the PC from the internet and it's now relatively little trouble, but the iMacs (I'm on my second) have never needed a call-out.
F