what happens is the roller clutch holds in one direction as you spin the output shaft, the other direction the roller clutch over-runs.
As the roller clutch holds you will be spinning a drum in the oppisite direction. this is where the additional resistance comes from.
If the frictions are dry(no oil yet) the resistance will feel nearly the same in both directions.
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.