Tried the Zinger out and went to our open dog park near Fern Ridge Lake (Eugene, OR). There is an asphalt road to & through the park which worked great. I tried it in high and my partner & our two dogs could hardly keep up. Driving through the grass area full of bumps worked on medium & I guess I won't need to get my highs from roller coasters anymore. I did get stuck on rocks & limbs and reverse was not quite powerful enough to back me out. My partner assisted. I do not like the beeping noise while in reverse. Can it be turned off? Also the on/off button had a loose rubber tab inside, but was easy to fix. Would have liked the logo tag to be in green & black to match my Zinger, but I colored it in with magic markers.