I really like this trilogy, as well -- so much so that I can't yet bear to read the author's other work. It give such a distinct sense of place(s), it has superb riddles, and a great bard (giving a sense of what Alexander's Fflewddur Fflam was trying to live up to
and eerily wonderful scenes of transformation. I've forgiven it the punning names which would shipwreck any other fantasy series that wasn't a commedy.
One of my favorite parts is the amnesia scene -- very unexpected, not at all conventional, adds to the story rather than stalling or derailing it. The revelation in the last book always makes me catch my breath, as well, even though I now know to expect it.
-Kushana