Finished the Bartimaeus trilogy, not sure what to think about the ending. I think it ended well, but it ended too abruptly. It could have had 2-3 more pages to explain a bit more and tie up some things.
Overall the series was great, I might even say better than Harry Potter, but the ending... I can't say it's "bad", it isn't bad, it just ends too swiftly.
"You lack the requisite spine and testicular fortitude to study under me"
"You do not know the first note of the music that moves me."