The base has survived a year's use well. And I mostly use it to lug wood about the place, occasionally bags of concrete. Rarely more than 250kg.
The sides are held on by rolled over 1.2mm steel and are flimsy in the extreme. They fell off quickly.
It says it's powdercoated, but I call BS, the paint has flaked off in places and it's rusting away nicely.
As a steerable flat platform it's excellent, but to call it a cart/wagon would really require fabricating a much more sturdy mechanism for the sides and ends.