Humanscale M2 M2DB1S Adjustable Articulating Monitor Arm - Clamp & Bolt Through Mount with Base - Black - Perfect for Home Office & Workspace Ergonomics

This is a very good monitor arm. Installation is fairly easy. The included 360/180/90 movement restriction rings take some playing with to get right, but it's a nice added feature. The cable management channels are great. The bolt-through grommet mount works well and allows cables to be run behind the mount and through the hole. I took away one star because the polished metal with white trim comes with a black cover for the VESA mount (see picture). That's all fine and good if your monitor is black, but I purchased this arm specifically because my LG monitor has a white plastic back. I was able to order a white VESA mount for $28 ($22 with discount code) from Humanscale. It seems counter-intuitive to sell a white arm with some black plastic parts.The product arrived in good condition however it was missing the necessary 4 mm hex key to set it up it was also missing screws to attach the arm to the monitor. Poor quality for being so expensive. Terrible product.This product is expensive, but it works very well, and I couldn't find anything else for any cheaper that would support the weight of the 27" iMac.Great product, supporting my monitor as I am writing this review