After years and years on my to-read list, during which I almost started several times and then didn't, and then procrastinated, and then looked at the book again, without starting, and listening to everyone going on about what a classic it is, I have finally taken the plunge into reading Frank Herbert's Dune.
Considering that it's supposedly a classic, I expected dense literature, so I was pleasantly surprised to find it (thus far, anyway), an easygoing read. Intelligent without being incomprehensible, enough action to keep one's attention, but not so much as to descend into complete pulp.
Not sure whether one could call it high literature, but it sure is entertaining.