Endymion is not Hyperion. If you don’t treat it is a sequel, but rather as a new book with Hyperion as a background, then it is a throughly fascinating and enjoyable experience.
Simmons is a master of imagination. The future he creats is highly believable and probable. Humans evolve and remain entirely human. Technological advances are a blessing and a curse at the same time. And the characters are all endearing.
Rise of Endymion is definitely on my list of books to read