So the last DS I had before buying this new one was a DSi years ago. Now that I actually have a 3DS I was interested to actually try out the 3D function. I had heard from some friends that they didn't use it because of eye strain and nausea, but the games were still fun. My results have been mixed. On some games I can have the 3D cranked all the way up and I'm fine. I even like the effect! But on others I feel like maybe the 3D aspect wasn't implemented correctly and I do get that nauseous/eye strain feeling. On the Nintendo first-party games it seem to be implemented very well, which you would expect. It's mostly on the other games I've tried from other developers that this issue crops up. So my question remains: Do most of you actually use the 3D function, or is it just a novelty?