Like some people, I initially found the velcro straps to be too short for my chair's armrests, but after 1 minute of observation I realized that you need to tighten the part with the buckle first out and thread the long end under the armrest of the chair and twist the velcro once and thread it through the buckle and attach to the fluffy end. (This is a poor design. It attaches securely to my chair and is comfortable, but I wish the velcro straps were better constructed and a little longer as the length was barely enough for the ends to stick together, so some chairs with thicker armrests won't work with this tray.As an aside there may be some soft rubber protection stickers on the table mounting screw to prevent the plastic from chafing right up against the table.Aside from the mounting issues it works and the quality is pretty much the same as what you get with the amount that Spend you on this thing overall, it's enough for my purpose (needs a tray when composing in front of my digital piano), the tops, armrest and mouse tray are comfortable)
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