I bought this set for my homeschool freshman son, wanting to get back to the basics of excellent handwriting. Having homeschooled two other children through high school who, despite being urged to do handwriting of some sort every school year through 10th - 11th grades, consistently balked at learning how to write manuscript. I'm sorry I didn't make it more of a requirement than an option.
I've noticed, and had confirmed my by other parents, both homeschooled and "regular" school, that there has been a significantly decreasing emphasis on this skill in the past 15 - 20 years.
I'm determined that my youngest will have this skill well developed when he graduates.
One key reason for this is that the older two students, one now a college senior, recognized their own folly upon going to college. Their lack of proficiency with manuscript, they've come to realize, just slows them down with note taking, in writing answers to essay questions on tests, etc.
Another reason for proficiency with this skill becomes apparent when its time for students to prepare for college, if they're intention is to attend one. Inability to use manuscript proficiency, some studies have consistently shown, results in a lower score on essay answers.
A lot of homeschool parents are "curriculum" junkies, so a lot of us have extensive collections of materials. I've had very many handwriting materials over the years and I find that the Spencerian set is the best one I've ever seen.
Skills are broken down into easily comprehensible and focused sections, requiring a small time investment for each. This makes use of the system much more likely; learning and practicing skills is not burdensome. The language employed is engaging and direct.
The materials themselves are attractive and very inviting. I haven't seen anyone encounter the set so far that doesn't respond with delight in the appearance and a desire to thumb through and take a look.
In addition to the elegant appeal of the appearance, the presentation and overall design for use is very efficient: lessons are in the theory book, which one will have forever available, with practice meant to occur in the copybooks. You can simply purchase one theory book and reuse it, time and again, and simply purchase a set, or singles, of the copybooks, or migrate to paper over time.
I'd recommend this set for anyone who is starting a child in third or fourth grade - as long as that child has average to above average reading comprehension abilities, or with intention of direct instruction - all the way to adults who want to improve their own handwriting.
If I were to do things over again on this subject, I'd start and stay with this program. In addition to all of its smart features, it is an incredible value, which I know comes at a high premium for a lot of homeschool families, who are always working to stretch their budgets.