I used to own a Gustbuster Metro 43-in folding umbrella.  It was dependable, but being a larger person, I always still seemed to get wet.  At least I could depend on the umbrella from blowing inside out.  One would think 43 inches would be fine to cover you, but most of the time, a shoulder would get wet, or my back, and definitely the bottoms of my legs.

The parts started to wear down after several uses, the elastic wasn't bouncing back anymore, so the canopy would come off from its ribs, and I'll mention again I was still getting wet.

So I opted for a Totes Superdome Umbrella.  It's a double-vented automatic that opens up to a whopping 70-inches, yet folds down to a mere 13.5-inches so it can still fit your briefcase.  It even auto-collapses too.  The canopy is securely attached to the rib so I'm happy to say that it doesn't come undone even if the canopy becomes waterlogged.  It was strong enough to hold up to 40 mph gusts we were experiencing one day.

I'm definitely drier now, and happy I have a Totes on hand.