Well, I got on today for a couple minutes. Demon Splitter seems completely useless and just for fun like all the other 1 smash attacks. Possibly faster vs very low level mobs.
Blade Shift seems pretty useful. A bit high on stamina, so probably only really optimal if you have your insane reaper up.
Mana Pistol... when I played, it was worthless. A waste of both AP and in-game gold.
Blade shift's damage is pretty low. So far I haven't found a good way to use it other than killing those ramming mobs.