anyone use mysql proxy?

I’ve always been interested in this product, maybe today is the day I try it.

http://dev.mysql.com/downloads/mysql-proxy/

MySQL Proxy is a simple program that sits between your client and MySQL server(s) that can monitor, analyze or transform their communication. Its flexibility allows for a wide variety of uses, including load balancing; failover; query analysis; query filtering and modification; and many more. Installation and build instructions are in the source archive below (mysql-proxy-X.X.X.tar.gz)