Monopod trick
simple way to make it more stable
Monopod Trick - clamp a stick on it
This is not one of the specific monopod reviews, but I wanted to add this tip on how to use your monopod by adding a second stability point.
You can get blur from any combination of movement of your camera and monopod; forward-backward, left-right, up-down, and rotating-spinning. Monopods can help reduced movements significantly but not in all directions.
A great way to add stability is to use a second contact point for your camera or monopod. That secondary contact point may be something close-by like a tree, a fence, a window or a wall.
Occasionally when I am shooting a portrait in low light conditions, I use my monopod in combination with any sturdy object that is available.
I wrote a more detailed article with additional photos on how to make a monopod act like a tripod: Monopod Stability Tips.