I've got the "full leather" Chalk/Black, and as far as I'm concerned, every surface in the interior is plastic. The "leather" on the seats is covered with a thin layer of plastic. The soft plastic is plastic. Vinyl is plastic.
There seems to be a rise in car care products, whether a cleaner, conditioner, or protectant, designed and marketed for everything in the interior - plastic, vinyl, leather, let's include rubber - because they are all essentially, in fact, plastic.
I would gladly get leather care products if I thought they would do anything for me that the "all-in-one" cleaners and conditioners don't, but I just don't believe that's the case.
300 is plenty, 350's too many, and 365 is not enough.