There is a fact people are forgetting here. If you set out with faith in the product you will see the benefits. If you approach with cynicism then you will perceive no advantage.
One of my customers didn`t like it the first time I used it and asked me not to use it. I still use it and she says it`s so much better without it.
Those of you who like it, including myself, stick with it. Those who think it`s rubbish then don`t buy it, don`t use it and accept that you have an opinion that some people disagree with.
My opinion is it does help with glide, it does leave an enhanced shine and if you pre-soak bird muck it comes off easier.
That`s only my opinion.