I have. 3 people. It worked well, though I will warn with 3 people, the vestibules get very tight. And what people do seem to get confused about with tent sizes, 3p means 3 people laying the same foot to head direction side by side. Nothing more or less. One thing to note, there is a right direction for your head to go. the tents are tapered slightly and their is a venting side to help[ with condensation.
I've got the 1p, 2p, and 3pm mountain star as well as the 2p storm star. Big fan of all of them for their purposes. Main reason I got the 3p was for some extra space when its nasty out with 2 people. Its not just wider but taller.
One downside to this size tent is foot print. Its harder to find a big enough, suitable area, to pitch it. But no other complaints.
