EZ UP makes many different grades of canopies. You can spend 60 bucks or 1,200. The higher end ones have aircraft aluminum frames, better locking hardware, and internal reinforcements in the crossbars.
I starting with $60 10x10 King Canopy units from the local overstock store. Most of the hardware broke within a couple of years. I moved on the the 10x10 dome shaped EZ-UPs. Those were nice because the rain ran down the sides of the canopies. You could put two together without a flood in the middle. It turned out that EZ-UP made them only due to Sam's Club asking for them. When Sam's Club dropped that model, EZ-UP stopped making replacement parts. If you didn't follow the directions exactly on how to put it up, it was really easy to bend the cross bars, making them useless. With no replace parts, it was time for the scrapheap.
I finally went with the higher end 10x20 aluminum EZ-UP, and so far it's working well. The build quality is better. It survived being put up by some people that didn't know how to do it when I wasn't there, and it was fine. The method they used would have bent the crossbars on the old models, for sure. There is no gap to deal with between the tents, and it's still easy to put up.
So I think you get what you pay for, but I'm only starting my second seaon with it, so we will see if it continues to hold up. The aluminum frame is very light though...have to weight or stake it down for sure.