I've worked Chaositech into my current campaign from its inception. I started out with hints and minor manifestations of chaos energy, and let it progress from there. I've put a lot into defining how it fits into my homebrew, from the very basic level up to the cosmological. As such, it has been working fantastically. My PCs are around fourth level at present, so they've seen a bit more, but still just the beginning. There is a lot of nastiness yet to come, and for now I've got them thinking they're about to close this whole show down in a session or two.
That'll teach them. ;-)