Very Nice deal. I love mine. Get the big wheel attachment now! I would not love mine as much if I didn't have that. With the big wheel, you can put a game on the cart, lean it back on all 4 wheels, then buckle it up. Can also go over different level surfaces like from outside over a door stop to inside with little effort. You can go from the big wheels to the small if you need to easily reposition the cart. Plus going over grass or whatever. Did I say get the big wheel attachment yet? The only time my big wheels are not on is when I am going up and down stairs.
Practice with it as Jediturtle said. You have to balance the weight and it tries to push forward when going up/down. Once you find the sweet spot it is smooth sailing