I ordered 10 umbrellas for my community pool. The description stated that the coupling was metal, the pole was wooden and it has a pulley system to open and close it. One of the ten I bought had a plastic coupling instead of metal, which I know will be very durable. I had three of the 10 with a double pulley systems which was nice. I had 7 umbrellas with one Pulley system. If you can somehow make sure that you get the one with a metal coupling and a double pulley system it will be the best umbrella you can get for the money hands down. I did my research!
one of the umbrellas did fail when one of the ribs became unattached. that was just poor workmanship. the wooden pole is thick and heavy duty. its not far from commercial grade.