I think it carried load ok. I had 3 adults and 1 child in it once and it seemed fine (don't ask me the numbers I can't remember!). Also I believe you can fit a 3rd rear seat belt making for a 5 seater which would be very useful if you have some kids - and due to the larger cabin it could actually carry 5 (small) people I reckon.
Certainly they are comfortable and a good ride and would be fine for long distance touring. Much better than a PA28 in terms of comfort though not for short fields.