I was always against having a trampoline. I felt like they were unsafe and frankly kind of unattractive in the yard. I was very concerned my kids would break their necks, or an arm etc. We were visiting friends when he little boy broke his ankle on theirs. The kids REALLY wanted one, and when we were picking out a playset the place had several on display. They now have ones with enclosures and the springs are vertical on the outside of the trampoline. There are no hard surfaces they can hit, except each other. I was still really hesitant until I got on it for the first time. I happened to be wearing my exercise monitor and I could not believe how quickly I was at my maximum heart rate. It is amazing exercise, and super fun. My daughter has a heart problem, and needs to keep active in order to be healthy long term. Truth is though that all the kids these days need more active time. We bought it that day. We have had it now for 2 years and the kids love it. They go on several times a day. No major injuries, a few bumps and bruises, but no more than they get doing other active things. We don't move it to mow, ours is anchored to the ground, and we simply lower the sides and cover it in the winter (and use the underneath for other yard toys), in the summer the grass under it doesn't really grow I just trim around the edges with the weed whacker. I also love that when they have friends over they pretty much stay outside playing now ...not much to clean up after!
Make sure it is anchored securely. Those suckers can really fly in high winds! I recall driving around after thunderstorms and seeing trampolines in strange places.
http://pediatrics.aappublications.o...html?sid=0f8a92ed-26af-4d02-a6bc-5ed36518ead6
this is a link to the statement and backup data of the American Academy of Pediatrics. (and I don't follow all of thier statements and guidleines for my kids, but a good place to start with actual information)
As stated most injuries come from multiple jumpers... (in our house the rule is simple , break the rules on the trampoline and you are off , for a month. no warning , no second chances. Do it again and we get rid of the trampoline. 2 years and the kids haven't broken the rules. )
30-40% come from falling off the trampoline
20 % come from contact with the springs.
In children under 14 the risks and injuries are on par with swimming pools injuries.
So getting a model like the one I referenced before, and being smart about setting limits should help reduce risks significantly. Still it is a personal decision. Lots of people wouldn't get a swimming pool either, but if our neighborhood would allow it (community pool) and we had the room I would love one!