Honestly, they suck. Seriously. I work at Guest Service at Target, and people return this very same item all the time because they are defective.
If you decide to purchase one anyway, please, please keep your reciept, or better yet, pay with a credit/debit card or check, so we can look up your reciept. Do not pay cash, unless you have a foolproof way to not lose your reciept, because then there is *nothing* we can do for you