I prefer the EZ up models. We have had a 10 x 10 for six years and other than a few small tears coming in the corners it has held up great. Last year we purchased the EZ up 12x12 just to have the extra room. I prefer the slant legs due to where we use the canopies. The slant legs along with nylon rope and plastic sand stakes make the canopy stand up in the winds along NC's Outer Banks with ease. We generally stay on the beach from around 10 am to 5 pm unless the wind picks up and the sand starts blasting us. Rust on the legs is why we purchased a new one. As far as setting up, I set it up by myself. I just go under it and lift the thing up by roof supports and generally one or two of the legs will latch into the pin by themselves. I do wipe it down when we get home with WD 40 because of the atmosphere at the ocean. This not only will prolong the life of the metal legs but aides a great deal in setting up. My wife and I take it down together though. It is not heavy, and not a lot of trouble.
You will not get exactly 10x10 or 12x12 with them. The 12x12 is about 10x10 actually shade. Of course as the sun moves the shade varies no matter what size you have unless you go gigantic.