This base is exactly what we wanted. We used water to fill the base, after putting H2O enough to move the base but still could move base to center the umbrella. 
Water drainage is conveniently on one side of the base. Living in New England means cold winters. The easy drainage makes less work when getting ready for winter. 
The base is big enough to put several plant containers on it, allowing for us to minimize the footprint on our rather small deck.