Definitely worth it.
Without the capacitors the motor will cause interference which will spoil your day, on the track or in the park.
But bear in mind that a lot of the more modern motors have small surface-mount capacitors built in. You can normally see a small circuit board on the endbell screws. The V2 motors have the board hidden inside the endbell.
I don't 100% trust the SM capacitors though, so if you are having interference problems, solder some on externally as well. Generally three should sort you, positive to negative, positive to can, and negative to can.
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