Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good theory, poor execution

The literature on the manufacturer's website (Spark Technology) implies that the CellStik can be updated to be compatible with new models by simply downloading software to "upgrade" the "stick". I got this as a stocking stuffer for my husband for Christmas. He has the Samsung A820 model and, as I write this, we have not been able to get updated software to make this compatible with my husband's cellular phone. So, this is a good theory--upgrade your phone and easily transfer information--but it is NOT a good product. I am truly disappointed.