And now for my close-up...
After two weeks it was really horrible, then it improved a bit. From the third to the fourth week I was convinced it had settled down to a natural state that was more sheep's wool than cat's fur. Then... it started to improve again, ever so slightly. It's been gradually improving ever since.
At the moment I'd say it's acceptable, but not nice. I can walk down the street with it loose and not attract attention, but it doesn't have the light, silky, shininess that it used to have straight after washing. It still feels a little oily, but nowhere near as bad as it did at its worst.
Oilymakes it sound worse than it is, but I can't think of the right word.
I did say that after six weeks, if I wasn't happy with my hair, I'd go back to washing it. Well, I'm not entirely happy with it, but I'm not ready to give up on the experiment just yet. I think it's probably still improving, so I'm going to give it another two weeks and reassess it then.