Daily Grams are great for Daily punctuation review, however I do not reccomend Easy Grammar, I don't think there is enough explanation to give a kid a good foundation, but your right it does look straight forward. If you are looking for something simple, clean, and straight forward try Winston Grammar. After a year of using it my kids know all parts of speech, a year of Easy Grammar netted us very little in that respect.
My Two Cents,
Julie