I just read "Last Light" by Blackstock and have the opportunity to read the next 3. Are they as good as the first? I sometimes get disappointed in high suspense book series because the next ones seem to be a letdown. Worth the read? 

i've read the first 3 (last one is in my TBR pile) and they were quite good. i think it gets better with each book

I agree! That was one of the best series I have read. The suspense keeps building. Worth the read.

I've only read the first 2, and have the last 2 on my TBR shelf, but I have really enjoyed them!

I have read the whole series and enjoyed it.  I didn't like the last one as much but that was because of what went on in the book.  I won't post any spoilers. 

They are defintely worth reading though.

I have read many of her books, but this series was the first of hers that I read and I believe that it is also the best.  You will not be disappointed by the last three books.  They help you to get a grip on what is important in life.