Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Twist-locks for extendable legs are worthless

I've had this Quartet easel for a few months now holding up a flipchart for a few hours once a month. I was initially disappointed to see it uses twist-locks on the legs, but I thought it would only be an annoyance. Wrong. Despite being careful/gentle with my twists, the 2nd time I used it and tried to collapse the legs when done, I needed to use pliers to loosen the twist-lock on one leg. And now, a month later pliers wouldn't even work to loosen and collapse TWO of the legs.Note: Prior to this one I had the lighter weight version that used cam click locks for the legs. I loved that one, but I lost it somehow and THOUGHT I'd be upgrading to get this heavier-duty version. Boy was I wrong.