Instruct: Classify Amazon reviews into positive or negative sentiment
Query: roof tree umbrella stand

The concept is very good. Some issues with installation. The tie straps were not long enough to go around the tree and the snaps used to attach to the umbrella come off too easy. Also the Pivot roller that the umbrella pole sits in would not keep the umbrella from tilting in a minor amount of wind. Once modifications were done to take care of these issues is worked pretty good. I would have liked to see gromet holes that secure the umbrella to the tree instead of snaps. Longer straps and a fixed "L" frame to provide more of a secure attachment to the tree. This may allow you to make it bigger as well.