I own 2 of the Roomba 980. I only bought the Roomba S series because of the debris unload. I never had a problem with my other rollers tearing up all the time, but the S series is constant. they desperately need to fix this.When they start to tear up they are making marks on my wood floor also. This is a huge problem. This is supposed to be less stress not more. These rollers need to be reconstructed ASAP. this is not fair to people that paid this much for this product.