I own the books, but haven't gotten to reading them yet. I should probably do that asap.
Not quite as far as you, but my position is similar. I've had the Southern Reach trilogy sample sitting on my Kindle for ages now, but haven't committed to buying and reading it yet. I'm currently doing a "comprehensive" reading of Stephen King's the Dark Tower series that includes reading things I missed the first time round like 'Salem's Lot and Insomnia in order to make sure I understand all the references that are in later books.
After that, maybe it's time to tackle this trilogy.