Here's an example of a mecanum bot (Team 2040 DERT) slowing down 868 allowing us to squeak out a close win at Boilermaker during a qualification match. Going into the match, we knew it was going to be tough to beat 868, so we asked 2040 to do everything they could to slow 868 down and give our alliance a chance.
http://www.youtube.com/watch?v=1XV0VbRaiFg&list=PLR10HG9lJB687vU1Ivd0nnyS TMYcpeN5p
Though I think mecanum is a little underrated, 868's drivetrain / shooting dominated Boilermaker.