This year we got a pool. Not a big one - just 3ft deep, 12 ft round. Wasn't much including the filter but I can't tell you have fabulous it has been. The boys are at an age where all they want to do is be in the pool and I am happy to sit (in the cubby) and watch them. Hours of entertainment AND exercise.
We are not great maintenance people, so at the end of the season it will come down - to make way for the footy pitch - but this is a note to self to do it again next year. Since this snap, we have put up one of those portable 3m x 3m shades and the pool is mostly in shade all day - brilliant.