I am sailing in Aegean Sea. Turkish Coasts and Greek Islands. In Turkey's marketing the most well known sail maker companies are North Sails, Elvstorm, Doyle, UK Sails and some Turkish Companies like Q Sails. When I contact them, I understand that they declare to use the same materials and they are all very proud of their sewing machines. etc. But, I try to understand the difference. Because, naturally as a well known companies like North gives price that almost %25-30 more expensive. Is it because of a well known mark? Or what?