I just recieved G3 and unistalled the older realflight sim's and installed G3 with all the add on's 1-5 and it works pretty darn well with full everything on graphics.
The only thing that I see wrong with the physics is on some not all scenery files is while flying if you fly above the trees about 5 to 8 feet the aircraft crashes.

The one question I did have is, can I play in multyiplayer mode online or in local network mode with my G3 to someone who has G2?

thanks,
Mark