I bought a Sirui K-30X and K-40X a few days ago.
Generally what I expected.
What I have found with both seems a little strange though.
I have read that some think the panning is a little firm, so no surprise there.
When I loosen the Panning Base Locking Knob, maybe half a turn, the head pans. Depending on starting position, somewhere it will grab, and I hear a sound and feel some "crunch". It feels like a screw / bolt grinding on a composite material, ie what I'd expect a bolt grinding on fibreglass or carbon fibre. If I continue to loosen the Panning Base Locking Knob it will pan freely a full 360°. There does not seem to be any friction adjustment regarding panning, it's either loose or tight.
After noticing on the K-30X, I immediately tried the K-40X and it's the same.
Anyone else experienced this?