Likes: Singapore Math works great for a "mathy" child. My son used Singapore off and on in first until fifth. We use it alongside other things. He loves it! There are short lessons, it's colorful, and there are fun puzzles to solve. I like it because it makes him think. It has very good story problems and is easy to teach, to a child who catches on to math easily.
Dislikes: This curriculum did not work well for my "non-mathy" child. She needed more explanation.