Very bad experience. Stuck for 4 days now half way though progression due to game bug that blizzard addmited, but could not fix yet. And I paid heavy$$ extra for early 3 day access just to get stuck for days on end. Blizzard support refused to comment or compensate.
Wait until game if fixed and discounted. Not worth the frustration now. Classes unbalanced, bad endgame experiences.
(Note, this is for live game at 11th June, not just beta. Fully released game is broken for a week now!)