Hey Norman
You are talking to a guy that chose polypropylene carpet tiles for our conservatory... why ..because they were solution dyed (Very little fade), hard wearing, plus they are comfortable, warm and look nice... just like me!
The earlier Polypropylene carpets I didn't like much but some of the modern ones look and feel just like wool...in fact I have seen a label on a 100% Polyprop carpet that says just that.... 'like wool'
They clean well, are hardwearing..the only bit I don't like is the flattening but the manufacturers are solving that one too
Cheers
Derek