I think trampolines are great for exercising but only in the right location.
My obstreperous neighbours have recently erected a monstrously sized trampoline in the garden which basically covers all the lawn plus they have attached the netting which imo, is a blooming eyesore, especially as it stands about a foot over the 6 feet fence separating our gardens.
They have always been noisy but now the noise can only be described as a cacophony. I would not mind but these are the same morons who banged on the walls because our baby twins were crying! A couple of weeks ago, DT2 (3yo) threw a tantrum in the garden and our dear neighbours slammed their windows shut! If they were a young, childless, couple I could understand their irritation but these people have 5 children who scream, stamp and jump all the time.
Before we had the twins and their children were younger, they were really loud but we tolerated it. Now that we have children, they expect them to be silent but at the same time, their rabble make more noise than anyone else on the street.
We want to move next year so I hope their oversize trampoline does not deter potential buyers because tbh, I would be deterred after what I have experienced.