This trampoline was bought about 5 years ago at Wal-Mart and I cannot remember the exact price, but it seems it was less than $200.00, we had bought the safety net enclosure as well separately.
It is the 15' round trampoline and to this day, my kids still get on it and enjoy it just as much as the day we put it up for them.
The safety net came down after the first year, we had issues with the zipper and the nylon belts that held the netting to the top frame kept slipping and coming lose. After two years the padding around the springs started to crack and tear, but you really have to expect that in something that is out in the direct weather year round. We did use tape to repair the tears for awhile before replacing it altogether.
The springs have held up wonderfully! I think there is a 300 pound weight limit on them, but both of my sons give it a good workout and they are in perfect shape to this day.
The trampoline material itself, it still looks brand new! In all honesty I did not expect it to hold up this well or as long as it has but it has been an awesome investment and it gets the kids outside and away from the TV's and computers.
The frame itself I believe is a heavy aluminum and we move it each time we mow and has been moved to our new house and there are no dents or bends.
The most important thing is teaching your children about safety. Mine were told the first time they horse played it was gone and it is still here ;) .As long as they are taught safety and respect it, it is a great way to get exercise and allow them to burn off excess energies.