I read them the minute I first discovered them. I don't know how I did... I must have just been googling for Myst merchandise as a teenager. They remain three of my favorite books of all time, and I keep them on my "favorite books" shelf
I am especially drawn to the Book of Atrus, since it more directly deals with the characters we get to know in the games. While the writing style can be stilted at times (the way people talk and think is especially unnatural at certain points)... the book's plot and characterization is subtle and well-rounded enough that I can't get enough of the story. I re-read all three novels whenever I go through and replay the games, which seems to be about once every 5 years or so?
I do have some trouble visualizing some of the worlds--there's something missing in some of the descriptions--but that gets fleshed out in a lot of the games. I'll boot up Uru to walk around the cleft so I can imagine it better when reading about it.
Does anybody know how nice the hardcover versions are? I've had the paperbacks for like 10 years but someday my dream is to, idk, get my books signed by Rand Miller, or one of the contributing authors...! And I'd like to have nice copies for that, if it ever comes to pass.