We bought the wagon for our 20 month old twins.  Other reviews are accurate about difficult assembly, but overall the wagon is worth it.  We used it for about 2 months so far and are also having difficulty with the front wheels bowing in and it's very hard to steer.  
Tried to take it on the beach in OC, NJ, but it's more like dragging it than wheeling it.  A good samaritan with more muscle took pity on the poor mom with twins and helped me get it back to the street.  
If Little Tikes could find a way to correct the front wheels and the steering issues they produce, the wagon would be 5 star.  

Also, after reading other complaints about the umbrella turning, we put a piece of duct tape where the umbrella meets the pole and we adjust it as necessary.  It's enough to keep it in position.