Ask HN: Competitor research for customer support software

andymorris and I are mid-way through development of a product for customer support departments, and we're searching for competitors. The following is a summary of our product; do you know of anything similar?

Chorus analyzes the sentiment of emails customers send your company. It gives you a dashboard with the results so you can track sentiment over time, and get insights into what makes people angry, and the evolving message from your customers over time.

The problem is that existing email support solutions only monitor response time, which is important for email support department management, but it doesn't tell managers and 'higher-ups' much about how people feel and why.