We had one. It was only a small variation. Kids loved it. I was not one of the top quality trampolines, and when it started to fade and break we got rid of it. Kids loved it when we bought it.
I bought my son a membership and an AFL Richmond jumper for his 7th birthday in May. He wore that jumper every day until the week after the AFL Grand final (only took it off to wash it). We go to the footy together, and it is the best $300 I've ever spent as we have something to do together every weekend. I think if you are going to reward the kids, make it something you can do together. Nothing can replace the family time.
you might have to get one of those VERY big trampolines