Actually my plastic has held up more than the metal ones like this one.
http://www.oypla.com/images/ga... I had this one but it didn't hold up but 8 years and rusted apart. Also I had a friend who got a nail in a tire and it was to bad to be fixed and the tire cost too much compared to the price of a new one. My plastic one is a little faded but after 6 years going strong. A little air in the tire and it rolls like new. Also had stored 150 lbs of bags of dirt for a couple months and had to drill a hole as it kept filling with water.
I did buy a metal one but have never took it from the box. It is still in my van 5 months later.
It was 59 dollars on sale and the box isn't in any shape to return. I will get it out one day. We also use little Tikes wagons left over from DGD's . They work great too.