Come's with a few great attachments, like 2 straps for your legs, two handles, a door brace, and small bag. You'll need the bag, so I'm glad this product comes with one. They flop all over the place and can be annoying if you're trying to store them somewhere without a bag.
Also comes with a little booklet with a few exercises that can be done with this product. This is fine, but you'll be better off doing an online search, and watching a video or two on how to use this product effectively. You can't just pick up the easiest band, wave your arms around a bit and expect to have had a good workout.
All bands are the same length, so they can be combined together to add more resistance.
Super strong design. I have no worry about the handles coming loose.
They're very light and portable. If you're trying to decide between a few free weights and these, (I suggest getting both, but if you have to choose) get the bands.