Amazon.com.au:Customer reviews: Tree Swing Hanging Kit Straps (Set of 2) Hold 5000 LBS Extra Long 10ft | 15ft | 20ft| Rope Hammock & Tire Swing Tree Swing Fast & Easy Way to Hang Any Swing – Outdoor Swing Hangers (20ft)
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They seem strong. We purchased them 13 months ago and one broke. I reordered the same ones. Why ? Because all of the straps had comments about breakage. On a good note teenagers use it for 3-4 hours on the weekends.
The straps were great and are sturdy, but the hooks are cheap and broke almost immediately. I happened to have a few of those hooks here, so I am currently using my own hooks. Depending on your child's age/weight it shouldn't make a difference, It would take a lot for it to wriggle out of the strap once any amount of weight has been applied. BUT they did break almost immediately.
I thought these straps were adjustable when I purchased them. The only way I could figure out how to adjust them was to wrap them around the tree branch additional times. Otherwise the straps are very strong and will hold my son well.