Bought one and they are perfect. Defo recommend
The weight limit is a legal thing - if someone heavier than 50kg (plus some safety factor like another 25kg) is jumping alone and very high on the trampoline in the centre then there is the possibility the stretch mat could touch the ground underneath - which isn’t good as they could break their ankles etc. Of course there are other factors like the frame strength, spring tensile and pad strength. If you’ve got a hole in the ground underneath or if the trampoline is elevated slightly then you can easily have much heavier people. If you’ve got lots of kids on it or an adult with kids and you’re all bouncing in different areas of the mat then it’s not such an issue as you won’t hit the ground. I’ve got this trampoline and we’ve had at least 250kg of adults/children on it without any issues. The more people on it, the less practical it is to jump to any reasonable height as you start cancelling each other out.
I weigh 115kg and I've been on this trampoline loads of times. My 6 and 8 yo bounce together and my wife often bounces with one kid as well. No idea why it has a 50kg limit unless they've significantly changed the construction in the last 3 or 4 years. Plum are excellent for customer services. At the top of the poles covered in green foam are small plastic caps which the rod holding the net runs through. In bad weather (yellow warning storms) I've had a few of these break, the plastic cracks. I thought id get shafted for replacement parts, if they would even sell them, but plums website has every part listed separately to buy as replacements, and the plastic caps only cost me 99p! (Plus maybe 3 quid postage)
Naturally its easier said than done but you should never have more than 1 jumper at a time, double bouncing is v dangerous for a number of reasons (i.e if someone is landing just after someone else has landed and fully depressed the floor then its like landing on a solid floor from a height). Also falling into each other and breaking limbs, I know people with broken bone stories from these and it was always due to more than 1 on at a time. As said I know in real life its hard to police this!