I generally have liked the AR system. Here are my reasons:
1. Until this week, our school has had every test available for books listed on the AR quiz site.
2. Beginning in 2nd grade I started guiding GS's reading choices based on what I found on the AR site.
GS picks out whatever fiction he wants to read(within some limits by me!) and takes AR tests on them if they're AR.
I pick out nonfiction books that enhance other material they are doing in class. Nonfiction at the same level as fiction is much harder to Ace, and requires more effort(at least that's true if the kid reads fiction like popping M&M's!).
3. The instant feedback on individual tests kept me informed on how well GS was reading. That tells me how to guide him to learn better.
4. GS is allowed to read at his own level, not limited by what books are in the classroom or school library. I probably use my library card more than my credit card. smile


Downside:
1. (Not so bad!) I read a lot of the books before allowing GS9 to read them. Many in his reading level might not be appropriate for a 9 year old, or maybe they address social issues that I think we need to discuss as a family.
2. A lot of fun books that other 4th & 5th graders are reading are below his level. Just this week his teacher said he could not use those for points any more. He hadn't used more than 1 or 2 for that, up to this point, but she's keeping public score of percentage of goal made. I'm wondering if she's trying to keep him from making it a blowout.
3. Once goals are met, not enough leeway is given on what should be read on a regular basis.