I’ll let some of the others jump in on how they use and like Spelling Wisdom, but I can answer some of the details.
We reccomend a pace of two or three lessons per week, based on Charlotte Mason’s practices. At that pace, each book should last about two school years.
The lessons are designed to be used sequentially to cover all the words and naturally increase in difficulty. However, if you need to reinforce a word that has been missed you can use the index in the back of the book to find other lessons that use the same word. You can then use those lessons, or even a small portion of one, for additional practice without just repeating the same lesson.
The sample book download contains a lesson from the beginning and middle of each book. The book and the Spelling Wisdom page give a rough guideline of the grade levels for each book. You can use that along with the sample lessons to determine placement.
Spelling Wisdom is available in versions with American and British spellings. We don’t have a specific Canadian version.
We have a prepared dictation video that tells more about the technique and demonstrates how it works.