What specifically do you want to know?
It's a high-fidelity combat flight simulator featuring an abundance of aircraft (payware addons) to include the A-10, F-15, F-86, Su-27, Su-25, and others. Many say that today, it is the most advanced simulator (available to the public) on the market.
At the current time, it is set in the Crimea, with further locations (such as Nevada) coming in the future.
A number of the aircraft are faithful reproductions (systems-simulations) of the real deal.
http://www.digitalcombatsimulator.com/en/