The Beachcomber 578 is what I call the "family spa" due to the various seating heights. One of the nicest molds out there IMO.
(http:// http://beachcomberhottubs.com/images/htpic_578.gif )
2 deep captains seats in top left & right with great therapy including neck massage
bottom right seat is a cool-down with some therapy and calf jets and the 2 seats to the left of that are higher as well for youngsters or just cooling down
Great footwell space with reflex foot massage which IMO, is one of the best foot massage options out there.
Most spas offer various seating heights and some great spas have been mentioned. Dry and wet test them once you've narrowed it down to 2 or 3 and get the whole family there.
I know what Stuart is saying about lack of jets in most cool down seats but I don't see that as a bad thing. Sometimes getting away from the jets for a bit is nice...