Our kids are age 2 to 6 years old and they all love it.  They used it all summer without getting bored.  Its very durable.  We've had a lot of kids on it at once and its in as good of shape as when we bought it.  

The only issue was with tipping.  If too many kids are on one side it can tip over if the pegs aren't in all the way.  We bought extra pegs (there are plenty of loops on the bouncer but only 4 pegs included) and made sure they were hammered fully in to the ground and that took care of the problem.