These bands are some of the most well constructed I have seen.  They also have clips on the ends which allows them to be used in tandem, so the red, black, green, blue, and yellow can all be used together for extra resistance, which is a major plus for athletes who need more resistance.  The door anchor included is a very simple design, but it works well.  All of the bands also have a lifetime warranty, just call them and they will ship you a new one (you have to pay shipping though).  The handles are well constructed, and the wrap around handle is pretty standard universal gym type stuff.  Will buy from this company again.