Yeah Hilly, my point was what KC said. My opinion's based on observation, on any busy summer day here there's 100+ people to watch foiling. Sure the RS series is likely a little less efficient than any wing without a step in it (that'll likely be gone by 2024). The 1150 has also exhibited some bizarre behavior in extreme conditions but does recover fairly well, AND Since ML farmed out their production to Italy I'd be that much more reluctant to fork over US$3500 for a foil set.
I'm mainly back into Go Foil for the mast and simple system (and this 18 page collection of opinions, sometimes I actually believe the cr@p I write)