Would you buy something if you did not know anything about it?

You can buy through following the advertisement and hearing from others who already used it 

Yes i will but... if the physical sample and quotation are available with me. 

When you´re working, as I do, in a specific and technical environment as the oil & gas market, you should never buy, or first of all, require any quotation prior to investigating the required good. Always use MTO´s or in the absence of them, technical data sheets and charts that define all the aspects of the object of purchase.

You can always have excpections to that if you work directly with your technical department.