Howdy  I got an EZ Up from Sams a few years ago it is a 10 X 10 and came with 3 walls. Now what Sherri said about wind and bad weather is true, but I sure do like mine and I don't try to set up in bad weather anyway. I have been caught out when bad weather moves in though. We got some serious rain one time and the canoppy did fine but it is only 10x10 so you can expect to get wet at the edges of the tent. We got some good gusts at my last show and it did real good . we were set up on the street and I used  bags with sand in them and they worked great. But from personal experience let me tell you if you get stuck in a real bad thunderstorm with strong wind it doesn't matter what kind of set up you have the legs break and the canopies tear and your stuff gets blown across the street. That was a 3 day show a few years ago before I bought the ez up. Lucky for me I was taking down my set up each night, but lots of other folks suffered. Size is important  but if you go bigger than 10x10 at lots of shows you have to buy extra space for the bigger set up and spaces usually go 10 x10 or 12x12 or so for the 1 and 2 day shows. So to me because I only do about 6 or 7 shows a year I stick with 1 space and use shelves and stuff to give me room to put out my stuff. Good luck to you hope you get filthy rich  I am half way there I got the filthy part down,  gw