Pros: Spent a few years on traditional spelling methods, even tried the copywork/dictation route and he could never remember from 1 week to the next how to spell a word. Nothing seemed to work until I started my son on Level 1 of this program. We are now on Level 3 and flying through it and he always remembers how to spell previous words. My youngest will be starting level 1 in the fall and fully anticipate this working for her as well.
Cons: Wished I had started it earlier!