I bought one from TSC for the grandkids a few years ago. They ran the daylights out of it the first year, most of the second year it was ridden very rarely, so I thought it might be fun to make my trips between the garden and the house.
I don't know how fast it really goes, but it seemed to me that it was going 30+mph down the farm lane! The front suspension smoother a lot of it out, but it still jumped over a lot of the bumps. The fat tires seemed to make it more stable, but the speed it wanted to run at was just too much for me, plus I couldn't carry any tools with me.
Now it's just sitting in the corner of the garage, waiting for the last grandson to get a little bit bigger, then I think I'll just let him take it home with him so the daughter can pay for the gas.