My two-wheeled Rubbermaid has taken a true beating. I never protect it, never "take care" of it...leave it out, toss it around, just plain abuse it. I think it's going into it's 14th year. Quite the workhorse...
Personally, I hate these garden cart styles. They tip and don't hold much at all.
What I like are the wheelbarrow style, wooden fram, two wheels in front like this one from sears. I have bought it in the past at true value. Its an 8 cubic foot, if I could find a 10 cu foot I'd buy it:
Two wheels in this configuration is MUCH easier on your back - the wheelbarrow doesn't torque, and saves your back, arms and also the wheelbarrow doesn't twist out of shape and break and lasts longer. You can go around corners with a load without wrenching yourself - you can take largeer loads more easily. Honest, once you have one, you won't want a one wheel again, but it has to be like the link above, not a garden cart. The garden cart style is terrible in my opinion.
I have one of theses - it has worked pretty hard for a number of years, but is now starting to fall apart.
It does not hold as much as the large rubbermaid two wheeler - but is a good choice if you have to deal with deep mud (ahhh SO glad I have moved barns so I do not have to deal with mud any more!) - the 4 wheels distribute the weight better, and the fat tires deal well with soft going. The "dump truck" style dumping is nice as well.
You do have to PULL it rather than push (and I prefer pushing) but it is a nice cart to have around.
I use it for moving my tack trunk (when loaded up, that trunk is heavy!) and moving sacks of feed and hay bales.
But for daily stall cleaning, I much prefer the large sized rubbermaid.
I don't think a pull-style cart would work for me. (DH has always said I'm a pushy broad...) If you're trying to get up an incline or over a curb or something, seems like the only muscles you could really engage would be your quads. With a push style cart, you can use your arms and core muscles as well as legs.
Lots of great links on this thread --Thanks OP for starting it. This has definitely inspired me to to upgrade my steel-tub one-wheeler with a plastic 2 wheeler.