My son is 7 and loves this thing!!! It goes at about a fast walk on level ground. We have a hilly yard and did does not get tired on the uphill areas. It does slip on wet grass and/or leaves. There is a small hook on the back and I can't wait to hook up a little wagon so he can run my yard and gardening tools around for me!
I am pretty handy, but the instructions that came with this product were terrible. (Worse than the kind that come with a LEGO kit for 8 year olds.)
A few things your should know...
The thing is held together by driving screws into plastic. That means the first time you put it together it will be very snug. But if you make a mistake and have to backtrack, the fit will not be as good. If there were terrific instructions, this would not be an issue.
The instructions show how the pieces fit together and in the right order. However, there are about 15 screws of about 5 sizes. The instructions leave it to your best guess which go where. So when I got to the end I had a couple of screws left and a couple of holes left and they didn't match.
Hints I can give are:
1. The 8 identical stubby screws hold the front and back decks on.
2. The front desk goes on first. I mistook the front of the diagram for the back and then had to backtrack.
3. Have a couple of extra small screws on hand.
I think anyone with average skills can assemble this, but not with an excited kid helping. My recommendation is to go through all the instructions with all the parts and screws in one pile. As you go through more them into another pile. Then at the end, you can see what screws and holes are left and you can rethink where they go. Then get the kid to "help" once you know where everything goes.