Children die from using trampolines, even with their mom standing right there watching. They can just hit wrong and break their neck.
Please google how dangerous trampolines are. They are not toys, they ARE supposed to be used with direct supervision. We were given one and I decided perhaps I was being too cautious. We took it apart and it's sitting in our yard right now.
One of my friends got one and the day they put it up their daughter was bouncing and the mat hit the bottom of her foot and broke her front leg bone right at the growth plate. She wasn't doing anything wrong.
The American Pediatric Association wants trampolines to not be sold to general public. They want them outlawed.
Over 100,000 kids are hurt every year on trampolines where they have to seek medical care.
The surrounds are worse than the trampoline, they get caught up in them and break arms or legs and pull out their teeth.
Kids can bounce wrong and break their neck and die. Just read some of the stories from parents who had trampolines and didn't realize what a hazard they are.
Also, if you do decide to get this anyway, check with your home owners insurance because they might cancel his coverage if he puts a trampoline on his property. They feel that strongly about them.
Also, if any other child, even one sneaking on when he's not home, gets hurt on his trampoline he'll be liable and have to pay their medical bills and the kids parents can sue him for a lot of money.
So all in all, didn't want one, Santa brought one, kids loved it, I didn't, we took it down, kids don't miss it at all.