Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware, do not buy this!

I should have insisted on my money back the first time! Within 10 minutes of opening our first shell shocker it jammed up and wouldn't work properly. Since I had already spent the $[...]for the battery that can only be used in this toy I decided to try another one (after a long interchange with the Tyco people and a 6 week wait). The second one finally arrived and once again, my son had it out of the box for not more than 15 minutes and it was obvious that it wasn't preforming as promised. So, if you do choose to buy - make sure you save your receipts for the toy and the battery!