CF Spoiler M Performance vs. ECS tuning brand

I was thinking to buy a Carbon Fiber spoiler for my 235i and I was browsing on ecs tuning web site and I saw an ECS tuning brand spoiler and it seems to be pretty similar to the M Performance which costs the double of the Ecs', the question is do you guys know if there is a big difference? Do you have any reviews or pictures if someone has installed? Does it worth to pay the double for the M Performance OEM instead of the ECS'. Thank you

CF Spoiler M Performance vs. ECS tuning brand