Design flaw:  The lower cross-bar (along the front that sits at the bottom), bends slightly upward in the middle due to the tension of the elastics holding the net tight.  So, if you kick the ball along the ground, even with a strong kick, it hits the bar and not the net, so there is no "rebounder" effect.  I and my boys (ages 7 and 8) were really disappointed by this, so unfortunately, after the initial couple of trials and disappointments, it's never been used.