The product comes in two flavors, Data studio, the free version, and Optim Studio Developer,
which is the paid version.
If you do Java Coding, or currently use Eclipse, it's a very nice tool. If you use Eclipse you can
add it as a plugin to eclipse, or you can re-install the API.
Pamela Siebert and Venkatesh Gopal have done a Developerworks article that covers how to
get up and running with Data Studio.