we bought ours when the girls were 2 and 5. I run a home daycare so I did spend more then most people, ten thousand dollars between the climber and rubber mulch, but even if I didn't have the daycare I would not regret the purchase at all. The grade school is a 7 minute walk if we are going at a preschooler pace, the next closest playground is a mile away and it is more a bike ride then a walk away. So pretty close playgrounds but not out our back door. The play value the girls got, the amount of hours each day that they played out there, the peace of mind knowing that they were safe in my backyard and didn't need to go elsewhere for fun, the ease of just sending them out the back door and listening from inside or watching as I did dishes, the joy they got from the set - all of that made it worth double what I paid. We've had it 8 1/2 years now and they still go out there to climb and swing when the weather is nice.
Now granted our yard is big, but the climber and sandbox get 80% of the play time, maybe even more.
FYI - we designed our own at Cedarworks, it has a curly slide, a long slide and a toddler sized slide, a rock wall, rope wall, spinning rope thing, a tunnel over the swings, 3 swings (wish I had gotten four, cause if each girl has a friend over we don't have enough swings), an eagle's nest and monkey bars besides all the other climbing stuff normally on playsets. We have ONCE had to tighten bolts on it. Never have had a splinter, never had to powerwash or stain it or any treatments of any kind.