I am quite pleased with the way Shugo Chara has progressed. It is slated for a long episode count, and so it would be easy for the show to fall into the trap of endless episodic filler, but Shugo Chara manages to make progress with every episode. Either the overall story is advanced, or we learn more about at least one character. The steps are small but steady, and I am personally am a fan of this type of pacing.
The way the show is paced, combined with the overall cute, girlish aesthetics of the show, it makes for an anime I can visit every week with no irritation or desire to see the plot move forward, so when it does happen I am pleasantly surprised.