I think the main thing G3.5 has to offer is the online feature. You just click on multiplayer and you're flying with other guys. It gives the sim a much more real world feel. Just like a real flying field. The best part for me in this is that the social aspect of the sim has allowed me to keep flying without getting bored. So rather than flying for 15 minutes, I can stay on for an hour or so. Since getting G3.5 and flying online my skills have improved a bunch.