I used Spelling Power as a home school parent for sixteen years with multiple grade levels. When choosing curriculum for a new Christian school (grades 6-12 only) this past year, my choice was once again Spelling Power. It is the most thorough and complete spelling curriculum available.
This is a great spelling system for really helping my kids to retain the words they study for longer than just the test. I will say it is a lot of work initially for the teacher to get prepared, going through the manual and video, etc. Once you get started, though, it is really easy. I love that I will never have to buy another spelling book!
This program seems great for younger children. I decided to give it a try after my son completed ABeka 7th grade spelling last year. He was able to test right out of the program, so it would not be of value to us.
We recently purchsed "Spelling Power", like so many before me, I found the thick book overpowering. As I got into it, the thick book is something that can be mastered. I followed all the placement steps with my 13 year old grandson. It took a few days, but now we are ready to start at a level that will not discourage him. This program, a least for us, will work much better than conventional spelling programs and I am confident he will be a much better 'speller' at the end of the school year using this approach. The Student Record Book can be purchased also, it helps the student see his progress. Keeps things organized for the teacher.