Hi Sylvio, i fly with WKM since last year and never had such woobling problem, wookong M in windy conditions is just incredible but you have to fine tune it...!!! (Gain, center of gravity, compass qualibration......) generally people let MK for WKM but rarely WKM for MK. With WKM i fell safer. And even if there were some problems with the GPS, everything is ok now. Firmwares continue to change the unit to flight in better conditions. So it' s just a question of preference but for me, WKM fly very very smooth, "clean" and sure i' ll never return to MK.