I have the original one and it has been working for 12 years, extremely effective as long as you cover the square footage correctly and see one another, now I got 5 pieces at a very low price, they sent me two different ones, basically they are the same, they are inferior and light, they seem to work, summer hasn't come yet so I will come back, anyway if you order, put a note about the packaging, the plastic wrap is almost non-existent, they threw them in a bag and they arrived damaged and one of them broken.
One year later, after going through summer, I bought many due to the price for all the spaces, two of them didn't work satisfactorily, the rest did the job, as long as they see one another, no comparison with the original one which costs 40 euros, so we managed fine.
I will come back regarding durability