I was discussing this very topic with a Eurocopter designer a while back.
When they stuck wings on a Gazelle the chief pilot took the first flight (as you do) then couldnt stop the thing as the lift from the wing reduced the available flare in level flight. When they did more study they found, not surprisingly, that the bigger the wing the more the aircraft behaved like a fixed wing aircraft, hence a variable incidence or free wing would do better - I believe Westlands are or are about to fly a winged Lynx soon. I imagine there's a lot of reasearch to do before we see a commercial one.
GA