Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Slow, buggy and frustrating

I've used Act! for about a decade now. I upgraded to Act! 2005 to remain current. The new version is slow, buggy and frustrating. I do not recommend this product. If you are considering using it, carefully check others' experiences before spending the money. I have not used any of the alternatives, but it cannot be hard to beat Act!