My new S 150i came with a removable screen (brackets attached) and two covers to replace the mounting brackets when you remove the screen. I notice most online screen products for sale include the brackets.
After I bought the scooter I was going to remove the screen and sell it, but now that the bugs are coming out I believe the advantages of having a windshield outweigh its dorky appearance and disadvantages. I think its tall profile contributes to wind resistance, but it is much easier to clean than the helmet gear, and I can ride open face in the rain.