Having not much to go on, I would say you need to answer a few more questions first:
1) How many are in your party and what’s your budget for the day? Max pass can quickly add up, so this would be my #1 question. However, since you’re asking about it I would say you probably are okay with the price
2) Are there any make or break things for you? If you don’t get to ride Soarin on your first day will your trip be ruined?
3). Do you have someone in your group who could be a runner? Max Pass isn’t the only option, you can still do the legacy fast pass
4) Are you doing this for Radiator Springs? Odds are good the fast passes for that will be gone by the time you get there.
5) Do you want PhotoPass? If you’re going to use that then MaxPass is a no-brained
I would probably error on the side of not getting a MaxPass and then adding if needed. You can just do that the day of once in the park if the crowds are busy enough to warrant it.