Review (Summary): "The DitoGear OmniSlider is a professional motion dolly (aka slider) capable of real-time camera moves, repeatable camera moves, motion recording with playback, slow-motion playback, time-lapse motion control, as well as stop-motion control.
... Along with the different track lengths. DitoGear offers two versions of the OmniSlider - a stepper version and a servo version. Stepper &Servo refer to the type of motor that the OmniSlider uses. Stepper motors offer high-performance at a lower cost than a servo motor, but the servo version offers vibration-free operation, faster speeds, lower noise levels, and 0.1mm precision with full motion repeatability. Read the review to get the full low-down on the DitoGear OmniSlider.