I have had one for probably 2 years. I use it frequently. Love it.
I can almost always find a place to stake it (even around pavement, often there are patches of dirt or flower beds where it can be staked. I can also rig it to any pole (fence, stake, guardrail, etc.) using bungee cords.
It's larger than other umbrellas, so it casts a nice shadow.
I can place it far from my easel, which is useful in many situations when you don't want it to be super dark under the umbrella and when the sun is near the horizon (I have a picture of it being used this way towards the bottom of this page: http://timonsloane.com/about
I've had it in high winds, and it has never broken.