My experience so far has been pleasant overall. There are some areas that could probably still use some tweaking, but the new abilities are a fun and welcome change.

A few notes from hunting tonight:

Creature Hunted: Juvenile Desert Armadillos
Relevant Ranks: Inner Fire: 450
Augmentation: 368
Debilitation: 240
Warding: 230

-Inner Fire and Augmentation are very easy to keep moving, was easily keeping both at 34/34 while just playing with various forms.
-Warding was more difficult to move, but not impossible. It just sat at a steady 6/34 while combining Bastion and Turtle.
-Debilitation was nearly impossible to keep moving. The constant sapping of Inner Fire was manageable if I kept killing, but it was difficult to keep track of my voice pool and I was unable to keep it above 4/34 while alternating between Kuniyo's Strike and Everild's Rage.
-Overall, Inner Fire seems to expend itself rather quickly. At one point I filled my Inner Fire in super celps, then, with no abilities active, took the galley across to M'riss and wandered up to dillos only to find that it had passively drained all the way back down to around 45-50%. Wouldn't mind seeing this slowed a bit more if possible.

Hope this data helps. I'll post more findings when I get a chance.