Nothing wrong with bitching and whining about particular carpet fibers here on Mikey's Board and I have no arguments with Marty's opinion.
However, these soft carpet are being sold, whether we like it or not, in both polyester and nylon, and I think that as professional carpet care experts we need to educate ourselves on the proper care and maintenance requirements of these fibers in order to educate our customers on same and to know how to clean them without causing damage ourselves.
These are expensive carpets purchased by high income people, and should be cleaned often! .... potentially great customers.
If I had a customer that experienced very premature wear or texture damage with these carpet fibers, I would check for proper stretch, verify if a recommended carpet pad was installed, and review their warranty with them, including the warranty on wear and the warranty on texture retention. I would be very carful not to make a claim to them that the carpet was defective or tell them that they purchased crappy carpet. I would only suggest they consider having a discussion with their carpet retailer and/or filing a warranty claim IF THEY FELT they had a warranty issue.
I think it's important that dissatisfied customers of these carpet fibers go back to their local retailers and complain.... so that the retailers stop selling those fiber and style types that are indeed problematic.