These are fantastic! We used them to create a playground surface in our backyard under a swing set. They provide excellent protection against falls and allow the kids to use bikes or scooters, unlike alternatives such as mulch or wood chips. Plus, there's no mud like with grass! After a year or so, we now have some minimal buckling in areas where roots have grown in, but it's very minor. We're so pleased we went this direction. It's worth the investment to not have to deal with mud or messy mulch or chips. So glad we did it!