These bands are great.  The only room for improvement would be better carabiners/clips.  The carabiner like things have sticky springs and have sharp edges which could potentially cut through the bands.  It is nice to be able to attach the bands to other things and I have used a bit of rope to tie them off to poles and trees.  Use a bowline around the tree and a linemans loop to secure an additional carabiner to.  This set comes with an exercise guide.  These bands are good when paired with the BMP exercise ball because you can focus on muscle groups.  Isolate the hips for those ab exercises!  Have fun, mix it up!