I have been looking at carpets and see that Godfrey Hirst (and I am sure other companies) offer both 100% wool as well as 50% wool/50% p;lypropylene. Does any one have an opinion on the 50/50 blends? I am sure the 100% wool carpets will last longer and may be more stain resistant, but I would love to know how much better they are. Also, in the 100% wool carpets the weight varies from about 28 oz. to 85 oz. How does the difference in weight affect how long the carpet will last. I know the heavier carpets should be more cushy but will they also last a lot longer. I would be using them in bedrooms. Thanks for your help.