These bands have been perfect for my Cross fit style workouts.  The bag makes it easy to transport and use in a gymnasium, track or field.  I also really like having the weight (colored band) options.  I think it's rare to have so many weight options for the cost of the set...super affordable!  The clips that attach to the handles make it extremely easy to change out too.  I very happy with the fast shipping.  I did call  Black Mountain to ask about  their sleeves to cover the bands, which were not in stock and on order.  The company was easy to reach and I talked to a real person...who provided solid information!  Great product, solid company!