Purchased 3 months ago, and used 3 times.
The 600 is too large for the small studio I work in and the tripod I use.
I have already purchased the 400 size, and no longer need the 600.
Very easy to use and works with your phone or controls on the slider.
Can be linked with DJI gimbals or other motorized heads off eBay.
This is in LIKE NEW condition as you can see in the pictures.