After too many years of perservering with the ancient piece of cloth I like to call a mainsail I've decided to buy a new one. I'm sick of being overtaken downwind and can't make the old thing any fuller. I take the downhaul tension off and it just gets flatter.

The question is which of the supplier to choose and what sail material is better. Do the newest generation sails allow for mast over rotation downwind ? If there is anybody who has used both Goodall and Irwin sails I'd like to hear from them.