At my work we use the Kenova K2 slider, really solid slider, smooth, quiet, and the build quality is phenomenal. Little up there in price, runs close to 300$ but you can't beat it, its one of the best mid level sliders out there highly recommend it. This is the link to it on amazon. http://www.amazon.com/Konova-Camera-Slider-Dolly-100cm/dp/B0098F0CMY