Wow! that's all I can say. It just arrived today, having been released a couple of days ago. IRON CROSS is the standalone, expanded and enhanced version of ROF that came out last year, I believe. I tried the demo at that time, but passed on purchasing the full version because of the handful of flyables, having to buy additional planes, online entanglements just to play, no single player campaigns, and on and on.
Most of those problems have been fixed with Iron Cross. Out of the box, there are twice as many flyables as the regular ROF and hundreds of skins, both authentic and fictional. It is superb! I've been going through the training missions after trying multiplayer right away and crashing every time. Graphics are on the level of Wings of Prey. This is a real SIMULATION, not sim-lite like Third Wire's First Eagles. There's even a career mode.
The negative for some will be the system demands. The RECOMMENDED is an i7 at 2.9GHz, 4GB of RAM and a GTX 260 with a full gig of vid memory. Fortunately my system exceeds the recommended, so I've got everything cranked as high as it will go and there is nary a stutter in SP or MP.
ROF:Iron Cross is a fantastic WWI simulation, perhaps the best ever. It's hard core and drop dead gorgeous.