We love Spelling Power and have found our children making great improvement in spelling through the use of this program. The student books save time and the kids love having their own book for daily tests.
We began using spelling power last year. I did not initially order the record books. However, after using them for a year, I can definitely say it is worth the expense. It keeps my kids on track, and I don't have to make a bunch of copies. It is a must (in my opinion, with my kids) for us to use the record books with this program.
This is our first year using Spelling Power...so far, we really like it. The record books are well worth the couple bucks. Yes, you could legally make copies/printouts with this program, or just use loose leaf paper, but these books keep all the tests in one place for easy grade-keeping and year-end review. My only disappointment is that these don't have quite enough pages for a year...perhaps b/c we tend to do Spelling 5 days a week, though. We especially love the backs of the pages, where the students practice any words they've misspelled by going through a 10-step study method.