K&M 23840 Microphone Arm

When using a lighter mic (sm57) the springs tend to be too strong. This can be partially solved by tightening the clamps in the joints.
When using a heavier mic (sm7b) the springs are not strong enough, it's almost impossible to retain a 90 degree angle (it usually falls back to 75).
The spring are also very noisy which can affect your recordings.
The mic connector is too close to the joint for use with a SM7B which causes stress on the cable/connector. you can solve this with an extender like the Shure A26X.

Unfortunately I noticed most of the issues after spending quite some time with it, would have returned it otherwise. I'm probably going to replace it with the Rode PSA-1.