I work for a vanguard dealer so I can get sails cheap . No need to go for the replicas. I don't think I would use one anyway. I like to practice with what I am going to race with.
I am sailing the lasder just for fun and I always got used legal sails. Now I wanted improve and bought a new one. I voted in favour of a replica because of the costs. A roostersailing replica comes for 294 and a folded legal sail 545 Euros. Quite an easy decission ...