Get a pool?

My kids want a pool and with tax filing coming up soon, this would be the time to get one if we are going to get one.  I was looking at a pentair pool but I just don't know.  I've never owned a pool before.  How much work are they (keeping in mind that we have several Maple trees in our backyard)?

Pool or vacation?  A pool all summer long or a trip to the mountains for a week?  Decisions, decisions...