The 2ds is simply a version for younger kids; they removed the primary breaking point, and a feature that alienated them (3d being a feature you can't access when you're 7-). There's really no point to getting one if you're older and already have one, unless you plan on tossing your 2ds all over the place, or prefer the lower price. Any feelings that it has a diffrence significant enough to get one along with your 3ds is just clever marketing by nintendo.