Good. They are indeed made of real potatoes.
After watching, if you wanna know which chemicals are used in the fries, check this other video, it only talks about it.
It is interesting to see all the care they take to maintain the same taste and looks, no matter the restaurant.
I don't know if I can really eat without any concern, but it is always fun to see inside these factories that make things we only see when finished. At their YouTube channel they have similar videos talking about other McDonald's products.
And now I'm hungry.