Single, no kids at home. X P100D. I chose the 6 seater because of the 4 captain's chairs. Never a single regret. 99% of my driving is solo, but when I load friends in the car I'm happy and so are they.
There are a couple of 3s at my office, and when I park next to them I realize what a good choice I made. There's nothing inherently wrong with the 3, it's just that I'm MUCH happier not having to fold myself into one every day. I've owned cars over the years ranging in size from MGB to Suburban, 2 Suburbans in fact, and I think the X is the best fit for me of any. Go big or stay home, as my dad used to say.