SHED SHED SHED They leave tufts of wool rolling like tumbling sagebrush throughout the house if you don't vacuum daily. I like to vacuum every other day and that's not even enough! 
I found the shedding reviews after I dug into the lower star reviews. Believe them. We've had these in high and low traffic areas for 2 months and they shed like crazy. They eventually should stop but they don't. Im surprised there is any rug left and there's not holes with the amount of loss we've had. One 7' runner requires the vacuum to be emptied out twice bc the amount of shedding will clog the vacuum after only cleaning half the rug. 
They haven't lost luster and despite the fact the backing is cotton, they have enough heft to stay in place in low traffic areas and only shift a few inches in high traffic areas, without a rug pad. 
Theyre so cool looking but this is a major downfall. Currently shopping for new runners.