NAB 2014 Rich from Camera Motion Research offers a tour on the iFootage Shark Video Slider. The intertia generated from the weighted flywheel spins as you move the slider and requires for a gradual smooth start / stop.
The iFootage Shark Slider has all of the professional feature sets including adjustable legs / feet, smooth carbon rails, extendable rails, adjustable bearings, and is unique with the counterweight flywheel.
As of this writing Camera Motion Research is the only US retailer carrying the iFootage Shark Video Slider kit sold with an extension rails (for longer runs), and optional flywheel for added inertia. The iFootage Shark Video Slider product is already available and can be found at https://CamotionLLC.com (click here)
Camera Motion Reasearch - iFootage Shark Video Slider Kit
If the iFootage Shark Video Slider was not impressive enough on it's own, the iFootage team had their own NAB booth showing off a new prototype programmable 2-Axis Motion Control Pan / Tilt Head addition for the Shark Video Slider. Each axis is capable of rotating a full 360 degrees. Combined with the slider the complete kit will offer full 3 Axis programmable motion control.
I'm not sure if you can tell, but the microphone wasn't far from the head unit. The unit is fairly silent even as it tracked across for real time video use. Aside from offering very advanced time-lapse photography features that can be programmed into a wireless remote, the head can be programmed for auto panning to keep a subject in frame. Stay tuned about this product.