Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It works, just don't be dumb.

It's always important to read the bad reviews to see the real reason why people don't like a product. In some cases, it's just ignorance that leads to a bad review. In the case of this bed rail, I saw that many people said (1) it doesn't fit thick mattresses and (2) it comes unlocked.All I can say is that if you're having these problems, then you're just not following the directions.First, there are thickness adjustments on each side. It comes shipped in the smallest position, so all of these stories about people stuggling to close the rail just make me laugh. Just open it all the way up, lock the "elbow" in place, and then squeeze it until the indicator shows "locked." Done.As for unlocking, all I can say is that you didn't lock it in the first place. If I have one complaint, it's that it's too hard to unlock when properly locked. My wife can't even do it.Bottom line: while there might be better bed rails out there, this rail does work and does fit thick mattresses.