Its a free mod and you can actually obtain the engine for it for free now if you do not have any Half-life 2/source engine games. You will not have shooter teamwork experiences of equal caliber in any game and on public servers with no admin enforcing teamplay. It is nothing like your typical anti-social/lone wolf shooter. Its not a traditional/crappy/trendy shooter and I highly recommend if you are into gameplay realism and teamwork. Just this weekend they released an update which definitely sorts out the overwhelming majority of deficiencies. At the time it had a lot of bugs and shortcomings which messed up the gameplay. This is a mod i posted about a little over a year ago.
