On a tenuous link, I cleaned a nursery a few days ago which had a mix of wool carpets, glue down, and wool mix carpets.
I did the whole thing with a Cimex. The wool mix was in an office which had been converted from (I'm guessing) a bathroom, and had damp patches in several spots. The room was only about 4ft x 7ft, but it was in such a bad state that it didn't warrant getting the TM fired up just to do a carpet which was trashed anyway.
I doused it in Releasit (to finish what I had left in the sprayer), went over it with the Cimex, and left. I called the owner to say that this particular carpet was trashed and she agreed - neither of us realised how bad it was as it had previously been full of cardboard boxes.
Anyway, I went back there today to collect payment, poked my head into the 'office', and it was like a new carpet! I had to ask her if she had done anything to it, as I couldn't believe the difference. She said no, and she was pleasantly surprised herself how well it had come out, as she had been planning on replacing it.
The point is that this is not a carpet I would have normally considered hitting with a Cimex (wool mix berber), but the results were better than the commercial glue down in the next room. I can see why Paul says that from now on he's going to be mainly encap, the results are much better than you'd probably expect. I just wish I'd have taken a photo for my portfolio!
As an aside, I did 2 x large play rooms, and the small office in an hour - including pre-vac and packing away. HWE at a guess would have been 2 hours.