I'm just past halfway through The Lost Symbol. As I expected, it's keeping me turning the pages, to the extent that I have time to read. I suspect that if I didn't have to do things like work, I'd likely have finished the book by now, even though I didn't actually get to start reading it until Thursday. So far, I stand by my assessment that while Brown's writing isn't great literature, it's pretty good storytelling.
I'm also still working on The Devil's Triangle, but I haven't read much in it since I started The Lost Symbol. I either need to make time for it, as well, or hurry up and finish the Brown book so that I can find out what's going to happen in this one.