Quantum Thief is still very good. The Fractal Prince is not as good, the plot is starting to get lost in the unexplained bullshit. Don't use terms like jinni, ghul, and Secret Names and just leave it out there to be White Saviour-ed in the end. I'll finish the trilogy (The Causal Angel is on my desk), but this may be something where I actually only like the first book.
Also coming up, I had gotten Mom a large print edition of The Starless Sea from the library, but she found it too confusing. Figure since I've got it and have been hearing good things about it, I'll read it before I turn it back in.