I just wrote a blog entry briefly reviewing this manga, though with the broader (and earlier) focus being on the three animes. You have to scroll down to where I mention this manga in
red text if you want to just read the manga review.
You can find it here:
http://assessingtheanime.blogspot.co...y-numbers.html
It's a bit of a long read, but it's all about Nanoha, so I think that at least some folks here might enjoy reading it.