we bought a 12ft "big bounce co" tramp off tradme. We have had it for about 18 months. The tramp itself is still in great condition but the pads around the outside need replacing due to the blue tarpoline type covering being destroyed by the sun & the netting is starting to wear out to. Our kids are 7 & 4 now & still use it regularly, i reccomend 12ft or bigger for a bit of space for two at a time. As for the netting, i'm not a big fan of it. We didn't have it in my day, i fell off once & hurt myself but i learnt alot from that & also the kids tend to use the nets as part of the fun & rely on them to.