I just d'loaded the demo a few days ago and tried it, but with the knowledge that the demo is very dated and the official release is very different in terms of FM and some other things. I'm reading the numerous boards dedicated to IL2 to get a better feeling for what is going on. FM wise, there will always be criticism, but it seems that they (Oleg and crew) are trying (like AH) to match flight data. I will wait and see before deciding, but I have several other box sims (EAW, SDOE, Panzer Elite, plus some jets) that still have some life in them due to their communities mods. May be hard to justify purchasing another one with big plans this coming year though.
To me, having a box sim is nice when there is a situation where logging into AH may not be a good idea. I don't alt-f4 and I don't like purposely augering or bailing if I need to get out pronto in AH (phone call, door bell, significant other, etc.). The box sim doesn't mind if you shut it down in the middle of action (weird huh? I guess I don't mind stepping out of the virtual world but do mind committing virtual harakiri).
IL2 seems to be another step in the right direction for sims. It doesn't have the massively multiplayer aspect of AH, but both have their own places in the sim market and both have their own unique aspects.
mauser