@Meta4 said they change the whole dynamic of the way the drone flies ,they are really for indoor flying where GPS is an issue ,i purchased a set for my MPP ,in doors they were great saved the props and the surroundings from damage even in tripod mode its possible for the drone to drift with no GPS
so one day i thought i will try them out helping a friend to learn drone control ,i put them on his MPP which he had just purchased ,took off and was shocked at how restrictive the flight envelope was with them on , it was like the drone had been fettered to a fixed point ,it struggled with the slight wind and every movement was laboured and slow
in the end i took them off and have not used them since