My daughter used Wordly Wise 3000 series before. It was not that helpful because the explanations given in the books are not clear, making her confused often. It was a big challenge for her to memorize words this way. The drills are fairly dry and repetitive, too. We quit after three months.
As her teacher suggested, we subscribed to Beestar's online vocabulary program as home learning supplement. She receives the practice every week. Every weekend, she would spend some time reading its vocabulary articles. These informative articles are fun to read and make her more knowledgeable. Best of all, they provide very detailed new word explanations and examples based on usage. She learned a lot though reading.
Now she has been using it for a year. We are very happy with such an interactive online program.
I used the Worldly Wise series for each of my children, and they found it very helpful. At one point I considered dropping it for a year and my daughter said no, she liked the way words she was studying in Wordly Wise would come up in books she was reading. I like the fact that there is a reading selection that incorporates the vocabulary words and that the program is so easy to use.