In my honest opinion it is fantastic. Wipers are not needed and If you apply it correctly you won't get the smears.
Rub it on in a circular motion like wax and do at least two coats. Leave for 15 mins and polish out with a wet or dry rag until the screen is completely clean with no marks. Enjoy! When you brake water will slide off when you corner it will run off the sides. The higher the speed the more effective but on my fiat and my audi it would run off at 30mph with no need for wipers.
Haven't driven the golf with it on but I'm sure it will be similar although I think the screen is more vertical.
Cal