I love the Spelling Power program. I do not forsee changing programs, but I do have one complaint about the student book. After roughly half a school year, we are almost finished with the workbook. I really feel that it should have included enough pages for an entire year.
We've only been using Spelling Power for a short time, but it seems very easy and effective! My 2 children love it too! I had heard that you could make do without the student book, but I highly disagree with that! You need both the teacher's manual and student book. The quick start dvd that comes with the teacher's manual was very helpful!