[apalrd]

As a driver who has driven plenty of tank style skid steers, halo style skid steers, swerves, and slide drives (in VRC), this is my opinion on driving:

The third degree of freedom(strafe) takes much longer to master than the first two (forward and rotation). This is true for mecanum as much as it is for swerve and slide drives.

My other opinion to mecanums, or any other omnidirectional drive system, is that the ability to go sideways should be taken with its advantages and disadvantages. Don't ever go with mecanums just because they look cool.

I have not yet seen a video of a mecanum drive sliding around a defender, as many people make mecanums out to be. I have seen a very well driven swerve do it, but I have not yet seen a mecanum gracefully fake out or otherwise evade a somewhat competent defender. If someone can show me this, maybe I'll stop looking so far down on mecanums.