VandenHul contact enhancer- Has anyone use it?

I'm wondering who has used the VDH contact protection and enhancer? What are your opinions. At about $60 a bottle I'd like to know what results that have been gotten with it.
Thanks in advance

Here is the URL
Hi,I use the ART Italy
and it is super,especially if you have tubes!It is made for the tube pins and all other contacts. Great product.