Excellent quality sliding arm. Very heavy base so no movement. Everything works as it should, add a ring light and you're good to go. (Get the 144LED one, the 56LED one I bought isn't as bright, especially important as the light path is split to the camera mount all the time) My C-Mount camera on the mount gives about 1/2 the field of view of the eyepieces, but that depends on sensor size, and can be corrected with purchase of an appropriate lens, but I just 3d printed a mount for my DSLR.Negatives... It seems to have been assembled in a dust storm.. several of the optics were dirty on delivery, and the zoom knob feels gritty as you turn it. I fully expect to dismantle this soon, clean everything and re-grease to make it every bit as good as the Amscope that cost a few hundred dollars more. I shouldn't have to though..