My boys are 3.5 and 20 months. We bought it before #2 was born. They use it almost daily.

It cost nearly $200. A cheapy by all accounts, from ToysRUs. It took Dh a whole lot longer to put up that he thought it would. Nearly half a day. It was worth it for the laughs.
It would be a PITA to dismantle and remantle. But doable.

It is 12ft. It a bit of a nuisance because we don't have much flat ground so it's on concrete - a big no-no.
It's a good test of your Pelvic Floor muscles too.

ETA: if i had bigger kids, i think i'd get a bigger one.