Interesting article and I have learnt a few things about apparant wind and twist. One thing not clearly described is the impact of RDM's on the rig and its operation and aerodynamics.
Reasons i buy ezzy's
nice price
low down power
high wind control
unbreakable (almost)
ezzy to rig and set
Hard to fault - i will always buy them. Top speed lacks a little but not a full on race sail...