This was very reasonable compared to most umbrella stands I looked at.  Thurmont, MD seems to be in a "high wind tunnel" of some sort, but this base keeps my umbrella upright (in the table).  You can really put 50 lbs of sand in the base.

It's a little tedious to get the sand in--could use a bigger hole--and a cap that comes back off, so that you can empty it in the winter, and refill in the spring again.  I had to leave the base of my umbrella up because I didn't think I could get the umbrella back in the base all the way.  Would be nice if you could unscrew the cap, but it seems to be locked once you put it back on.  Why?