I got this slide for my daughter when she was 16 months old. We needed a toy for her to climb -- so instead of saying, "Don't climb this!" we could say, "Go climb that!" We were also facing a winter in the Northeast when playground play might not always been possible.
This toy is great for physically active children. My daughter uses it every day (a claim I can make for only a few toys). She particularly loves slide (of course) and the basketball hoop.
I don't love that the basketball is not to scale with the soccer ball and the football, and I don't love that there is a hole on top, ostensibly for throwing the football through, but it is irresistible to toddlers as something to throw themselves through! Not withstanding such a head bonk, we are very pleased with this toy.
I am optimistic that she will be able to use this for several years to come (my guess is that it would work for an average-sized 4 year old) and that it will lend itself to pretend play as well. There is a hole to climb through so that the child is under the slide. It is supposed to be used as a soccer goal, but I think it would make a nice entrance to a fort.
I will also note that assembly required brute force and liquid dish detergent as lubrication.