Goooood, yes. He should be rather less of a thorn in your side, now. Unless your opponent starts fielding him with Biomancy powers, so he'll be regenerating wounds or getting +D3 S/T, etc.
The Tzeentch Prince does use Biomancy, but with only 1 roll (is it 1?) due to being forced to take a shitty Tzeentch power, it's not too troublesome. Iron Arm's the only scary one.