After a night on PTR, felt like the set bonus isn't all that great.
My first thoughts are that 2piece is pretty useless without 4piece and that the later would result in a fair change of our playstyle and itemisation. (Less spirit and DP)
That being said, the stats are still pretty decent on 3 of the 5 pieces so we might as well go for 4piece bonus asap.
When i tested it last weekend, the Light of Dawn proc didnt happen at all, so that is probably a bug right now, only the Eternal flame one did. its basically free healing, which i guess is good in theory. but its a little meh. I will be passing for other classes probably.