Definitely worth $40!
I bought this for my 2-year old niece as a birthday present. She and her 4-year old brother have played in it non-stop for the past few weeks. They LOVE it! Just be forewarned that your kids will find creative ways to leap into this thing so supervise them well.

Unfortunately, a sudden rainshower hit this weekend and water got trapped inside. As a previous reviewer mentioned, there are NO drain holes so the thing wieghs a ton. My brother is still trying to figure out how to get the water out... but we may resort to puncturing it and patching it up. Lesson learned: NEVER leave it outdoors in even the slightest bit of rain!

Finally, if you are thinking of adding balls... buy ALOT. I purchased 200 and they didn't even cover the bottom of the bouncer (NOTE: See picture with boy in green shirt). I would guess you'd need at least 600-800 balls to fill this thing well. The balls are expensive and the kids would have been just as happy without them, so consider whether or not you really need them. Also, it's not much fun picking up 200 balls once the kids decide to have a "snowball" fight with them from their Jump-o-lene fort:)

Great Fun

My 4 year old lives it. I bought it for something for her to do on rainy days inside and she has a lot of fun bouncing and playing inside walls. Kids live getting in things with walls and this is better than a cardboard box.

kids love this thing!
though my 8 year old is really too big for it, all three of my kids love it! the 2 and 5 year olds do not seem to tire of it. my 5 year old punctured it with a pencil, but i patched it up and it is working great! i definitely recommend it!

Save Your Money
This toy has not held air from the first day. I have to blow it up every time my kids want to jump on it. I say save your money and just buy a trampoline.

My grandson loves this
I bought a jump-o-lene to keep at our house when our 2-year-old grandson comes to visit. Two was a little too young, but now that he's closer to three he loves it, and wants to use it several times whenever he's here. It's bigger than I thought, and takes up a lot of space in our downstairs family room. We have to stand it up on one end or roll it into another room when it's not in use because we don't have enough room to leave it, and I don't want to deflate and inflate it all the time. We haven't had any trouble with punctures, but we don't allow toys or hard objects to be used in it. I would love to be able to have it outside in the summer, but again, it's a storage problem if left inflated. Overall though, I would recommend it. Great physical exercise; great fun!