Just started to use it, and just used it on a Wool Berber as well and wasn't happy.
The carpet was lightly soiled cream scrubbed in with pile brush and left to dwell for 15 mins, ended up after I had cleaned it put prespray gold on, and it did the job and extracted.
I have only had one or two good res ponces from micro-split, but still willing to give things a try.
Im going to keep on trying with pureclean and see what happens on different fibers before I bin it...
Aidan