Instruct: Classify Amazon reviews into positive or negative sentiment
Query: profoundly disappointed

I have a Nikon D80. I bought the Nikon SB600 to use as a secondary flash, as its description seems to imply. It does not work that way. DO NOT BUY THIS as a secondary flash unless you already have an SB800 or SB900. Sadly, I thought that Nikon products would work together better. I feel cheated and very disappointed by them and this product.