I did a lot of research into umbrella bases. This was the only one I found that could be moved around easily. Other bases had only 2 wheels and required tipping the base onto the wheels. And often the base had no handle to tip the base so you needed to tip it using the umbrella pole, which might bend it or break the assembly. THIS base doesn't need to be tipped. The locked wheels don't really lock the base down solidly since there are 2 more unlocked wheels, but the base won't be blown around as a result and it's not a problem. This base does not use sand or water to weigh it down, it requires bricks. The bricks are very easy to find at **** ***** (for $0.$ each).
My only problem has been that I left the umbrella open in a pretty big storm and the whole thing did blow over the umbrella and base and as a result, the add-on table shelf broke. But I will order another, because I love having a table around the pole.