It works great, but the sections are so hard to pull out. It's so stiff. Does anyone else have the same issue?
Tight is better than loose, it will loosen up with use.
Can the whole magnetic adapter be taken off as I have another Ulanzi magetic twist head I'd like to use instead of this one?
Yes, there is the Ulanzi magnetic adapter on the top. Just push the button, rotate it and pull off. You should be able to use the one you have.
What is this product made of? Is the telescopic arm made of metal?
it's made of high qualiy ABS, and it can quick release for gopro