Yes it is worth it
"The first book was great and the second book even better and though the third is a bit too wordy at times and also feels slow at times it brings an ultimately nice conclusion to this trilogy. Fitz is one of my favorite protagonists in fantasy and I hear people complain about his character but personally I think it's in character for him to be the way he is. He is young and it makes sense for him to act like it and Robin Hobb did an excellent job with his character and really every character in the trilogy. If you want people to feel real this series is excellent and excels in understanding people. I think you should buy Assassin's Quest."