Like most of these folks, I worried that it would be too big and occasionally people will comment that it seems to big or looks stupid when you talk on it, but here's the reality: Its big, but it's thin and the bezels are set up to make it easier to handle than many phones this size. If you don't want to be seen holding it up to your head, then use a bluetooth headset.
And like the others, I find it fits in my pants pockets fine (even with the Nokia case on it), but it's a bit to large to fit well into a dress shirt pocket, but that really isn't a big deal.
Sometimes I worry someone will maybe snatch it out of my back pocket so I find myself just holding it, but it's about the size and weight of a day planner, so I kind of treat it like that.
I also have iOS devices and I can't say I won't consider the iPhone 6 when it comes out, but I have to say for the past 6 months this has been my daily driver and even when I try to move away from it, due to some of the limitations of Windows phone, I find my self coming back to it. It's a really great, solid, well-done device and for those who say it can't be a flagship because it's too big, I say they are wrong and need to actually use it for a bit before they say silly things like that. It might be too big for some, but most people will adapt quickly, I think, and appreciate it for what it is - a great phone!