Talking from a competitive gameplay perspective: 
	 
	Aim-120B against R-27ER was a totally good matchup but with the new memory mode gimbal change it makes crank and diving against Aim-120s hard because dipping into radar gimbal limit means your missile is trashed and the 120 carrier can continue pressing you. 
	 
	Also R27R against any Aim-7 is affected by this, because Aim-7 carriers can constantly dip into gimbal memory mode and thus achieve a greater dive and crank angle and gain F-Pole advantage over you, while when you do it, your missile is lost.