These are a nice set of bands. I had shoulder surgery and they work great for rehab.  You can add more bands to increase resistance. I have used some other brands before but this is a nice set and the bands don't lose their resistance like some of the others I have used. The door anchor works great and the metal clips are nice compared to other brands.  I was always a free weight only guy but I can get a good workout with these bands and now supplement my free weights with them. Hopefully I will not have to use their warranty but from what I have read and seen Black Mountain stands behind their products.