I've probably eaten there a half dozen times this year, but it's mostly been for breakfast since I was in a hurry and there's one not terribly far from my house.
As a general rule though, I stay away from fast food. I like their breakfast better than any other fast food place I've tried though. Last year, I don't think I ate any McD's, but I had BK once, and the year before that...I don't think that I ate any fast food.
I tend to stay away from the stuff because it's really not all that great. It's not a calorie issue with me, it's a taste issue. If it was better, I'd probably eat it a little more, but the only real thing it has going for it is that it's cheap and fills the void long enough for me to get where I'm going and make plans for lunch/dinner, depending on the time of day.