That's 50% off of the normal price. The Vue 6 Pro Studio is the version just below the Infinite version. A comparison chart indicating the differences between the versions can be found here:
http://www.e-onsoftware.com/products/index.php?page=4
For anyone thinking about purchasing Vue, this could be a good thing to do. If you later decided to upgrade to the Infinite version, you would still be saving almost $200 from the standard Infinite price.
Vue 6 Pro Studio at 50% off = $199.50 (Download)
Upgrade to Vue 6 Infinite = $299.00 (Download)
Total = $498.50 (Download)
Vue 6 Infinite regular price = $695.00 (Download)
This wouldn't work if you wanted a floating license, because you can only get the nodelocked license from the upgrade.