Used briefly for testing and review, as well as for a few month period when it was the primary slider for YouTube videos. Overall, lightly used and still in great condition. Listing includes only the slider (no batteries included, it uses Sony NP-F batteries). "Double travel distance shortens the length of the rail slider, making it more portable in travel. And when you shoot, the slider won’t show in the frame. Thanks to the excellent weight capacity, as well as integrated low-profile mount and supporting feet, the rail slider implements single length and double travel distance in any mode (desktop, ground, tripod, and fluid head). This meets both requirements of photographers for portability and long stroke."