I am looking at a new cruising main for my Alberg 30 from North Sails. their quotes were very reasonable. I have a question about the material they quoted me. They recommended their best material to be Premium NorDac and was about $400 more than their 4800 Nordac sail quote. The question is...Is the premium material worth the extra cost? I am guessing that my current main(made by north) is about 15yrs old. it is still in usable condition but I would feel better with a new one. Is 4800 a newer material than my current main and if so why buy the premium if the current has lasted this long. What are your thoughts?