Instruct: Classify Amazon reviews into positive or negative sentiment
Query: May be safe but impossible to use

This item is very awkward to set up and use. Never was able to get it to lock properly and finally gave up in frustration. It may be a very safe product but when it is unusable it is not safe at all. I returned mine to Toys R Us on a Tuesday and was not suprised to find out that 3 others had been returned already that week.