I saw a lot of the first three books in the series when I subbed at the middle school - so I looked up reviews on Goodreads.com.

I do not envy your reading.

Also, there are at least 8 books so far, and I think a total of 12 (or even 15) planned.

P.C. Cast edited an anthology of vampire stories, and accepted one of her daughter's works. In case you want to know about their comparative writing abilities (apparently the elder has won awards, though I don't know which ones). And I found an interview with them, where the daughter complained that her professors didn't take her writing seriously, even though she gave them signed copies.