For the last couple weeks I've been playing with an imperial knight (gattling and cannon) in my mechanicus army, and it's been really sub-par.
I just did the mathhammer and found I could take 3 grav cannon servitors, a data smith and two triple phos kastellans
and that cost ~80pts less and does more damage even before you consider that the robots and servitors will do even better if there's a dominus nearby, and the robots are locked down and double tapping their guns. Further you can use that strategem to make them both shoot better.

With the knight I was keeping the dominus nearby and sinking all my command points into keeping it alive and killing stuff.

So my question is: has anyone had any luck using IK and how do you use them?