Never downshift using engine braking only if the reason you need to slow down is unexpected. You will get killed. If I am riding alone with no traffic I will take roundabouts with engine braking, but if there is traffic around I do tap the brakes just to make the light come on. Trouble is people can check to the right and take their eyes off the road because you are still accelerating as far as they can tell because they see no brake light out of the corner of their eye. I personally, given plenty of braking time and not in heavy traffic, release the throttle, (possible brake), clutch in drop 2 gears, clutch out, ride, (possible brake) clutch in drop a gear (possibly 2), clutch out, ride.