Safer. In-ground trampolines are generally safer than normal trampolines because they're flush-to-the-ground not raised above the ground accessed by a ladder. Parents have peace of mind when they let their kids loose on an in-ground trampoline. There's no worrying about young children falling off the ladder or remembering to zip themselves in.
Statistically, most serious trampoline accidents happen when children fall through an open zip/damaged net or fall off while climbing up the ladder to access the trampoline. These risks are negated with an in-ground trampoline.
Better visual appearance. In-ground trampolines are not so unsightly as traditional trampolines which can be an eye-sore in a garden. Above ground trampolines take up a significant amount of space and are immediately visible in a garden. For those conscious about the presentation and look of their garden, this is a significant drawback. This is not a problem with in-ground trampolines as their lower profile makes them less obvious, or indeed hard to spot at all - they easily blend in with the surrounding landscape.
More freedom to play, more fun. Kids can run on and off the trampoline at will and play many more creative games. There's no net or platform to interfere with their enjoyment. Parents need not supervise as much as issues of 'getting on' and 'getting off' the trampoline are removed.
No fear of being enclosed. Young children sometimes get frightened being zipped inside a net away from their mum or dad. An in-ground allows parents and children to interact more - mum and dad can stay in close contact at all times.
Better bounce. The trampoline frame is buried firmly in the ground allowing no movement of the frame. On a traditional trampoline energy can be dissipated as the frame moves a little when you bounce. This does not occur on an in-ground trampoline resulting in a better quality bounce.
Quieter. In-grounds are less noisy because the frame (which can squeak) is buried underground and the retaining wall keeps the frame very rigid. Trapped air escapes silently through the pads.
Lower maintenance cost. In-ground trampolines cost less to maintain if you do not have a net which is the most frequently required and costly replacement part.
Less damage risk. In-ground trampolines eliminate the possibility of damage occurring because your trampoline cannot be blown away in high winds.
Great for parents. Climbing up a small ladder and through a small zip can be somewhat off-putting for an adult. It's much easier to just walk onto the trampoline. You'll love it!.