I gave up on the Roissybus a couple of years ago. It's just a long city bus with a few extra racks for luggage. Unfortunately, few passengers use the racks so luggage is often blocking the aisles. One time the first person on the bus took the front seat behing the driver, and left her 2 large bags in the aisle for eveyone to climb over.

I suggest folks take the Metro the either the Arc, then use the AF buses. All luggage stored underneath by attendants at both ends of the trip. Better seats on the bus too.