We had a 320 for 9 years with 4 kids. Ages 8,6,3,3 when we bought it. 2 in the midberth, 1 on sofa, 1 on floor. 17,15,12,12 when we traded up. They just got too big. And the 2 older were now teenaged girls with teenaged girls need for mirrors, make up and hairspray. Of course, in 2 years the twins have already outgrown the starboard bunks in our 500. Good thing I'm still the tallest or wife and I may be ousted from the master cabin