Spelling Workout is great. We don’t use it all the time because we have Discover the Scriptures and Life School. We also have life, which is how we mostly learn to spell (making lists, writing letters, etc.).
Of all the workbooks out there for spelling, this is the best, in my opinion. Every lesson has a non-fiction or fiction reading piece which is very interesting, at the very beginning. They see the words used in context first. Then they practice writing the words, have some learning games and do grammar and vocabulary activities, too.
After every 5 lessons, there is a unit review lesson to remind them of the words from the past 5 lessons. My kids love Spelling Workout and think it is fun.