No, to be honest I'm only playing with it because I have a four litre bottle at home anyway.
In my opinion It probably makes little difference what is used at such low dosages just as long as it breaks the surface tension down.
I've not tried Vision and probably never will so can't critisise their product really. If you look at their claims then Gg4 seems very similar - adds a bit of shine maybe, helps a little with cutting through the dirt etc. It just makes the water a bit wetter.
I think the Vision boys claims are pretty fair to be honest, it's a shame they have attracted a ridiculous fan club from Peters forum who seem intent on boosting sales for them. Seems to be the Gardiners hating Tekbook loving Chinese pole worshipping bunch that stick together.
My advice would be ignore the stupid fairy stories of what Vision does and listen to one of the more sensible members of the trio who sell it - he's not claiming miracles but must be rolling about laughing when some customers post the drivel they do
I've had a laugh with the Vision boys and taken the pee out of them but if they can pass their product on at £60 a litre for something a customer will never notice then who are the daft ones? Just sit back and let it go.