Super training is a lot easier than the old-fashioned EV training, that's for sure. :) EV training required you to search and defeat a specific set of Pokémon in order to increase certain EVs, which took a lot of time, patience, motivation, and energy. But in super training, all you have to do is take a few seconds and play a couple of mini-games. Once you're done, your effort values would be raised instantly without any kind of hassle!
So far, I've super-trained about three of my Pokémon—Blastoise, Chesnaught, and Talonflame. Blastoise's EVs were spread so that it can take full advantage of its defensive stats. I've raised Chesnaught's effort values in order to fine-tune its Attack and Special Defense. I would've raised its Defense stat instead of Attack, but its Defense was good enough already. It didn't need a boost. As for Talonflame, I've modified its EVs in order to maximize its Speed and Special Attack stats. Talonflame has access to a variety of special-based moves, so I thought giving an increase to its Sp. Attack would be a good idea.
Super training is great—I love it. I hope that they don't make this feature exclusive to X and Y only, and decide to have it implemented in all future Pokémon games.