In our windy, high desert weather, our umbrellas have remained upright!  Im excited that they can store when emptied of the water and go from 48 lbs to only 6lbs when its time for me to put them away for the winter.  While they are stationary, their round shape makes it easy to roll them to another location when necessary.  And, the rounded all-over shape prevents the possibility of stubbing your toes on them!
Best price, also!  Im very pleased with my purchase!