Our bigger kids enjoy this (12-15).The thing that disappointed me about this ninja line is that it doesn't work very well when you have a wide age range using it at the same time. That's because you have to have it higher for bigger kids because of their height and weight and then little kids can't reach the attachments. We bought a swing for it (not included) thinking that our three year old would then be able to play on it at the same time as the big kids. Unfortunately that didn't work because the swing is too high in the air for him to get on by himself. However, the swing was a huge hit for the older kids! They love bouncing and swinging on it.The other downside is that it's a bit involved to add or move around the attachments. The line has to be taken down or have A LOT of slack in it to add/move attachments.Otherwise we're happy with it and plan to purchase additional attachments.It looks like my son will love it. Unfortunately the quality isn’t great. A lot of the stitching is frayed, and the cover for the rachet doesn’t work, as one of the “snaps?” (Not sure what they are called) was not installed correctly so I can’t keep the rain off to prevent rust.Purchased as a gift for our grandsons. Was a hit with the 7 yr old, and meh for the 9 yr old. Definitely a great gift for kids that love to climb and hang from things!I'm writing this with 3 kids crying because they really want this to work. We live in the wide flat prairie with no trees, but, I built a play structure and monkey bars and have sunk plenty of post holes so I thought I could make it work. First of all, this is VERY LONG. Maybe I'm the only dummy that didn't realize that 50 feet is quite long, for comparison my swing set with a platform and 4 swings is 14f long. So, it is long, that means the stress it puts on the end posts is great. You also need to set it rather high for kids so the post/pole needs to be about 10 feet above ground. I sunk a 2x4x14 and a 4x4x8 3 feet down and added a brace and it still bends, AND our swingset, that I thought could be a decent achor, completely lifts off the ground with our 40'lb child trying it once.On the positive side, the quality is great, fit and finish are fantastic and the engineering is sound for TREES. The rachet is easy to use and I could have this up and ready on TREES in 10min or less (after the first time).I'm going to try a shorter version, that might make the stress more manageable. Don't repeat my error in thinking a 'strong pole' was something I could DIY. PS. in researching methods (after I failed) I found plenty of notes on how NOT to use on a structural part of your house etc. there is more strain than you expect.This is my second ninja line, the first being the 36ft version. We are absolutely thrilled with that one so far. This 56ft version though left us wanting more. As in more loops to anchor into!Why sell a 56ft line with only 25 ft or so of anchor points? Now I have to spend another $20 to buy clips to create new anchor points which, for a quality product such as this, seems to be a major design flaw. If it's too cost prohibitive to sew in another 15ft of anchor points how about charging another $10 to $15 so I actually get what I pay for?I have zero complaints about the quality of this product but I'm a little bitter about the situation I find myself in having installed this for Christmas. Either way, please adjust your product design and of course, buyers beware. Top notch product but not NEARLY enough attachment points for the length you are purchasing.This was a great Christmas gift for my 7 year olds. As others have noted, the loops for placing the obstacles do not run the length of the line, so that's a little disappointing, but not a deal breaker.Overall happy I’ve set it up for kids from 2-8 adjusting the height to suit and they love it. I’m having a harder time finding just the right trees for adult use. just a few things to pick about , the hand hold elements are great and attach very easy and secure to the line. The line calmed 56ft but the usable space to attach the hand holds less than half that , so if your spanning a longer distance all the hand holds will be on one side ( in the sewn loops on line)Works ideally in a space of about 20-30 ftThe ratchet to tighten it down is also on the cheep end , I’ve had a similar sized heavy ratchet for slackline for years and it is much better than the brand new one this kit comes with. I found mine hard to unwind even with handle in the unlocked position.This didn’t really come with installation instructions. It seems self explanatory but a simple diagramed instruction sheet would have been nice. The line is sturdy and I believe it will hold up. My boys are 9,7,4 and they like it but don’t use it near as much as I’d thought, probably because they’re not strong enough and it gets old fast. I had also purchased an extra rope ladder which helped add some interest. In hindsight a zip line might provide just as much fun.First of all, neat idea but there is no way that you can install this at the full length and stay off of the ground. I torqued the thing as tight as I could between two big oak trees and my 10yr old boy still touches the ground at the half way point.I ended up shortening it to 15' and that was good enough but I'm disappointed in the setup anyway. Lesson learned, I won't buy this again.This particular length (56') spans way too far a distance to remain taut!! Placing it at a height my kids could reach left them sagging right to the ground. It would have to be placed so high in order to be effective, no child could reach the apparatus without assistance. I think the shorter length would be a better option if you had the right set up available, but this length just doesn't cut it.J'avais pris ce kit car c'était le seul assez long, malheureusement, j'ai dû en acheter un autre d'une autre compagnie. Semble belle qualité, je vais la revendre a qq d'autreKids love it, install of the accessories are a pain thoughKids use this everyday for hours on end.