Fairly easy to install. There is an error in the instruction manual at step 20 it says to attach D1 to D2 with 8 screws U. I think this is a misprint. 

The frame construction is solid. It’s like a lightweight steel. With a rust resistant powder coat. 

The roof is very light weight. It’s like 
a honeycomb material with a plastic UV film. Doesn’t seem durable. Time will tell. 

The description says polycarbonate, which is fancy word for plastic, but don’t be mistaken this Roof is not hard plastic, more like plastic cardboard, easily dents