I spent some 250 hours flying the 1100 in PNG with all landings between 5000 & 14000 ft. Unlike the 206, the C18 engine was derated to 270 hp, so it still had good power at altitude with an excellent rate of climb unlike the 47. The 206 started to lose power from take off & so was useless at altitude until they had C20 fitted.
Tragically my first instructor was killed in a 1100 at a Paris airshow.