If you want to buy a cheaper slider, you need one with bearings, not one with friction. And it's the best of the bearing based sliders because it only has 6 wheels instead of 4 like the others. 4 wheels outside and 2 inside. This is an important point as it is MUCH smoother than the others on the Revain. In addition, the rails are made of carbon fiber, making it so light that it can easily be mounted on just a tripod. If you're not buying a motorized slider, this is the best economical slider…