I needed a 'Magic Arm' and remembered that ProMediaGear makes them- and got one off B&H with some other stuff. Honestly I didn't even bother looking elsewhere or for something cheaper- I just want one that will work perfectly. PMG has a fantastic reputation for a reason. This arm has an impressive level of hold and stiffness. The inclusion of adapters is very welcome. Many different uses- small monitor, small lights, hold something in a specific position, etc- mount to just about anything if you attach to a mini super clamp or similar.
I do a lot of shooting from different angles, not just from tripods. Using brackets hanging from the the ceiling..etc. The A12 is just perfect, the build quality is great, strong, durable and I have no problem trusting this piece of hardware with any of my camera gear or equipment!
Added this to the apex of the pro series tripod to fix a laser range finder or mobile device. It is very well made and functional.