Id say it depends on what you want to use it for. Ive had an MS with RFS for 4 years with 4 kids. I get nervous with the kids in the trunk. They are the safest seats in the car in a front end collision but the thought of getting rearended scares me. There is no AC flow to the trunk area so the kids get really hot in the summer. I have 2 kids who get car sick riding backward .
I bought it thinking it would be used more than our minivan for the go to family car but we normally default to the van. That said its been amazing having 2 cars we can all fit in. No musical carseats for varying schedules, hauling other kids, van getting serviced. None of the "you take that car i need the one the kids can fit in" when sorting family plans. Its been amazing for that.
If you are looking to use a 7 seater as a primary family hauler id strongly reccomend an X. If you want the extra seats for convience or for backup to your primary vehicle then the S has been perfect. We have done a phx to LA trip with all 6 of us in the S and it went fine...was able to store luggage stroller and whatnot OK so its definitable workable as the primary family hauler, but if i replace our odyssey with a tesla it will definitly be an X.