we have one of the early EZ-ups when they just about the only one. Much heavier duty and physically heavier, all galvanized steel support structure. This beast is about 25 years old the canvas, rainbow color, is starting to fade but we left it out in the backyard one whole summer by the above ground pool. It made annual treks to the lake where it stayed set up in the blazing sun for 4-5 days.
As far as rain puddling these original units have brass grommets in the middle of each of the four areas so it will drain anything but a monsoon. It is only 10X10 but we also have to solid sides for it that we used extensively when we tent camped.
We bought this originally for my wife's business she had selling scented crystals at swap meats and craft shows, mostly outdoors and strong sunlight would fade the colors.