I've come to really appreciate the consistent quality of K&F Concept accessories, and these magic arms are no exception. I've been using this type of accessory for many years, and for those who haven't tried them yet, they are extremely versatile for mounting all sorts of equipment in close proximity to my cameras. I've used them for monitors, microphones (with an adapter), wireless mic receivers and a whole bunch of different items. These particular ones have a larger "wing nut" type tightener (as opposed to a round knob) that I find very easy to grasp and to exert decent torque to lock the arms into a stable position.

There are only a couple of things that a little less than ideal, though. First, the overall length is very useful for most purposes, but not so much for accessories that I want to keep real close to my tripod arm (to hold a remote control, for instance.) This is a utility issue, and not a design flaw though - I do have a couple of very short magic arms for those situations.

The other thing that's less than ideal is the lack of any kind of super clamp for those instances where you don't want to mount it on a cage or directly to a tripod head (and that's assuming your tripod head has at least one 1/4 x 20 socket available to mount it.) I frequently need to mount items to tubular mounting points (a small hair light to a boom arm, for instance). That's easily remedied, of course, by purchasing a small super clamp by itself, but then you've increased the amount of money spent.

Overall, the build quality is quite good and the price is reasonable. Recommended.