These bands are excellent and so is the customer service who replaced a band with 8 months of usage that had some minor wear on the band itself.  I use these bands regularly and they have held up well.  I even bought a second set for the office as they are so portable.  I also purchased a second set of handles and the Velcro straps for working the legs.  All Black Mountain products I have purchased have been very high quality.  I highly recommend their products.