I received my mount just last week, and due to Spring storms here have only had it under the stars one time, so these are first impressions. First: It holds my 120st refractor securely at any angle, including straight up (!) With the 50mm finder and it's mount, this is about 11 lbs. Second: Motions are smooth, both in fast slew and slo-mo. It takes a definite push, but it is not jerky in movement. Third: Stability seems excellent. I gave the tripod a nudge and the vibration subsided after only 4 or 5 seconds. Add to the above that it looks great and is reasonably priced. This item should be high on the short list of anyone needing an alt-az mount for a medium weight refractor or reflector.