Build quality – it never crosses my mind the kit will break.
Tuning / wind range – typically stops having to de-rig and rig and smooth at both minimum and Max settings
Stability – no movement of the power around the sail.
Fool proof down haul guide – nice to have no guess work
Rock solid masts – same as the sails, I don’t expect them to break plus the mast programme of being able to buy just a top section for example makes loads of sense and is cheaper
Mark Perry, From West Witterings, West Sussex, UK