Review on NB North Bayou F100A-B Full Motion Monitor Arm: Swivel, Gas Spring, Height Adjustable Stand for 22''-35'' Monitors - Ultra Wide Long Arm with 6.6-26.4lbs Capacity by Kenny Marozas

The arm itself is well made and works well, but the attached "Vesa" mount is custom sized. The larger of the two dimensions on the plastic mounting plate is offset 1-2mm from any monitor I've tried attaching it to and the inner mounting holes are offset 4-5mm from the monitors you might be thinking. I'm not sure what standard they made it to, if it was even made to a standard, but it's not VESA. Still, with a larger mounting jig and because the plastic mounting plate has some settling, I was able to use longer M4 screws and a couple of nylon washers to distribute the difference between the two mounting patterns by a gap of about 4mm that kept them from properly were aligned, and was able to securely mount my LG 34WK650-W monitor, albeit without the aid of the mount itself. Edit: I've found that my LG and Samsung monitors have non-standard mounting schemes and don't arm themselves. It's worrying. This leads to the need to purchase a third-party or LG/Samsung mounting bracket. I got around this by drilling out a rivet for the LG quick release bracket on the LG stand and using some long M4 screws and nylon standoffs to install the LG quick release plate to the North Bayou bracket. I had to use the smaller of the two assembly hand patterns and a marker to mark on the board where the screw holes matched and then drill those holes myself. I then had to buy some M4 nuts to attach the bracket to the arm mounting plate with screws and spacers. The LG quick release mount is now securely attached to my North Bayou arm.