While this is quite good on its own so far, as someone who read and loved the manga, I feel a bit betrayed by what they've done. At the time of writing this, I'm only 4 episodes in, and they've already taken out a major character and rewritten something that would be important for the later storyline. I can only imagine what they'll remove in the rest of the season. What I would say is if you haven't read the manga, do so. It's not rushed at all, and it makes much more sense.
It's still enjoyable, but frankly, I'm disappointed. They could've made a masterpiece out of this anime, and instead, they've created something that while pretty good, won't be remembered like HxH or OPM.