Angie, the website is full of info! I posted a review at my blog – http://www.learningwithcharlotte.blogspot.com
To answer your specific questions:
ages – I’d say 11+ would be fine. im using it with 4 kids – 12-14 – right now. I taught all of these kids plus 10 others using Analytical Grammar season 1 and Junior Analytical Grammar last year. EVERY.ONE.OF.THEM greatly prefers Get Smart and so do I. We have regular aha moments. Interestingly, the teaching sentences are often short and simple, but because the understanding is there, it translates to other longer ones. The explanations are exceedingly clear. We went through quickly until we got to new material and now we’ve slowed. We will finish in late April or early May and the kids will know all the grammar there is.
Duration – like analytical grammar, get smart is a get it done approach. The main program Get Smart can be done in one school year. Then they offer Stay Smart (which I bought as part of the pkg, but haven’t used yet) to use to keep sharp.
Needed – the teacher manual and student book (I bought the PDFs and printed for $9-10 each in bw.) The videos are good and worthwhile, especially if you would benefit from the extra help.
Next year my ds11 will use the program on his own. I’m not planning to teach a class. It will be an independent study for him with the videos.
Hope that helps,
Christie