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I use this ball head as my main head. For those unfamiliar with ball heads, this particular model allows you to change any direction of the camera with a simple unlocking.
This is an upgrade over cheaper heads due to the quick release plate which I would highly recommend. You can attach the plate to the bottom of your camera and quickly and securely secure and release the camera from the tripod. The locking mechanism is safety locked: once in place you can swing the bronze lever to lock the plate in place - very handy.
Moving the ball head is very straightforward with a loosening of the controls giving you full movement immediately. The locking level provides gradual resistance so it's easy to set the tripod so that with a small amount of force you can change the angle, but the camera doesn't move on it's own.
This is a great tripod head for being able to quickly setup a position while being able to slowly fine-tune the angles. With practice it is a brilliant head for providing stable photography while changing direction - locking and unlocking the head as you need to redirect the camera - something not possible with pan and tilt heads.
This is a relatively small head which won't withstand very large DSLRs and lenses. It also doesn't fit perfectly on the larger tripod heads as it has a small footprint so you will need to match your tripod to this head (or vice versa).