It's safe to say that he has a **** ton of damage and his ability to heal himself and teammates allows him to skip dev gloves and go straight into mana stacks with Transcendence Which is a real help though I do like to have some life steal via the form of Soul Eater or Asi.
I've already made a guide on this so check that out if you really must know what build I use. But back to my general thoughts about him which are..."mixed"
His passive is really powerful early game and slightly goes strong late game due to it's scaling. His Training Exercise is beads for your other teammates due to it's ability to cleanse but his number two; Masterful Shot it's really annoying especially for people like Neith and Loki.
Apart from that I do like Chiron and I hope they tweak him just so he can be countered by other hunters. One major change I want is for his Masterful Shot not be able to track anyone in stealth such as Water Illusion and Vanish.
Happy Hunting
-Sods
When's he coming to the Xbox platform since I'm here anyways?