Another big Sirui fan here. The feet on the Sirui are substantially better than those on any other brand of monopod with feet including Manfroto/Bogen offerings. They are just in a different class of stability and strength. You will find reports of the others snapping off. Sirui actually recommends that you stand on the feet for more stability if you want to, the others tell you not to because they will break.
Also, there are two sizes classes with the Sirui and the larger class has bigger feet (broader spread) for greater stability--worth considering.
Not as stable as a tripod and I would not take my hand off with gear on it. You will find videos where people leave a camera on it, push it and let it rock showing it doesn't fall. I consider that foolish. But i do consider it much more stable than a straight monopod. And it is so much faster to set up...
If you get a model where the base can be detached, the base can be used as a tabletop tripod and the stick can be used as a lighter monopod with no base. The base is a significant proportion of the weight. Bottom-heavy is good for a monopod
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