[Rich Ross]

The rollers are a passive feature of the wheels. So, if you get pushed, you will simply slide that direction. Mecanum drives and mechanum wheels deal more with diagonal forces ( imagine the linear motion of a screw, it helped me). Holonomic drives are far easier to push because omni wheels slide so much. Mecanum is better in that aspect, but i'd certainly advise talking to a team who has done it before pursueing such options. We did a holonomic, which was sweet, but it definitely posed a lot of challenges.