Carbon Fiber Masts - Good or Bad?

[Marvin VE3VCG]

Light weight gear is important for man portable operations. Recently carbon fiber masts have become available. These are very light and stiff but are reported to generate losses. The amount of loss, if any seems to be somewhat controversial. I've seen several different videos on this subject and would be interested to get any feedback from someone with real field experience using a carbon fiber mast. I'm sharing a video from SOTA Beams demonstrating one of their carbon fiber masts both in the field and in the lab.