I LIKE these bands, but DON'T like this particular seller. If you can find these bands from a different seller, I think you would be well-served by these bands. I had originally thought I would order the Bodylastics MMA set of resistance bands (http://www.bodylastics.com/mma/
), but when I found they were temporarily out-of-stock, I Google'd and found these ProSource bands from the seller you listed. Since I needed the bands for an immediate trip out-of-town, I ordered the bands with expedited shipping.
Long (tragic) story, short... seller promised delivery by 2nd-day air, and then couldn't/didn't deliver on-time. I had to refuse delivery and fight the company for a full refund (which was awarded by PayPal). I ended up ordering the MMA set from Bodylastics when they came back in stock.
So... keep in mind that, unlike Bodylastics, the seller mentioned here is NOT the manufacturer, only an online retailer, and you should be able to find these bands from another seller.
Keep up the good work, and best of luck in your workout/weight-loss success!