But you do need to take into consideration that the battery in the S3 is only 27 watt hours vs 42 watt hours for the Surface Pro 3.I read somewhere that a reviewer thought it charged slowly but that statement was not quantified. However I believe the S2 charger was 24W and the S3 charger is 13W so that would be almost 50% slower give or take.
So charging time should be really nice on the Surface 3.