There's one reason I want it for AC; Skin of the Construct.
1d8 temporary hitpoints and an option from menu A is quite nice for a fighter or a soulknife, since it can mean a fly speed, extra hit points, and other goodies.
I want to boost the level so that the menu A option stays with me for more than 1 round.
I've been looking at Overchannel, and it looks rather decent for what I'm trying to do.
Plus, I think you can stack Skin of the Constructs, so you could potentially gain every option on menu A and a ton of temporary hit points if you have a source of power points.
If I was to make the Soulknife in e6, and I used the alternate feature that allowed me to get Hidden Talent more than once, then I would get Mind Link too.
Plus, if I get it through a class feature, wouldn't that make Soulknife my manifesting class, and thus eligable for Practiced Manifester?