Well put simply, I'm just a really satisfied customer. the Mac has just been great and hasn't let me down in any way. I have Firefox and Opera installed but I actually like Safari....
I still use Office and Wintel in work and I can swap files no problem between the two, the Office for Mac is a great product from MS.
So I'm afraid that's what it boils down to for me, I'm just very happy with my computer. Simple as that.