The bulk of the top boats have been with North in recent years-and I will say from personal experience that North makes very good, fast, but not very durable sails.
I've had North, Ullman, and Quantum on my boat. The Ullman main was way too flat, Ullman jib had a very strange cut (very high clew) but was fast once I figured it out. Quantum was real nice stuff-fast right out of the bag, durable. North's main was cut very differently-much deeper draft, very different rig tune. We seem to be a different boat in light air with North-where we used to die in our PHRF fleet when the wind dropped, now we hold our own at the top end of the division.
"Smiles" in LIS swears by "Z" sails (and I will testify to his speed), and "Chinook" (also LIS) used to be very fast using UK.
