Good solid umbrella.  Our deck is a high wind area and it stays put quite well (it is important to fill the base with the appropriate amount of water).  Having said that, with the umbrella tilted at near 90", it can blow over, so you have to keep an eye on it and bring it down when appropriate.  The mechanics of the umbrella work well.  It's easy to position and adjust as needed.  Overall we really like it.