The Green Machine did take my boyfriend a good few hours to construct, not the easiest to put together. If the front tyre bursts or needs pumping the mechanics are tucked inside the faring of the front wheel and not easy to access. We both went out and had a go and it was fantastic fun! It has been hidden in our garage since August though, as it was a Christmas present for my 7 year old son, who loves it! He is the envy of the kids who live around us and they all want a turn! The seat slides back with two butterfly nuts on the side, so it can be adjusted easily. I am not sure how long the back wheels will last though, as they are plastic not rubber, so with all the skidding I would guess that they won't last long, but I am assuming it is possible to buy replacements. A good fun product for all ages.