I got IF and i think its a nice game for this price. I also got ARMA2 combined operation (CO) and with the Invasion44 mod for Arma 2 i think i get more ww2 stuff, so i ended up playing ARMA2 CA with I44 mod instead. Some people got problems insatalling mods on Arma, but i use the Six Launcher doing the job verry easy.
Six updater & launcher
https://dev-heaven.net/projects/six-arma-updater/files
NB! The six launcher is the easy one