The other attachments without vacuum just don't work for areas like cup holders in the car, or cracks and crevices around the kitchen, etc. These are great for all those hard to reach areas. Fits perfectly fine on our vacuum.
I honestly bought this on a whim because I vacuum every surface in my home. Then my husband dropped 1/2 pound of ground coffee in the kitchen. Wow. This saved at least an hour of cleaning time because I could just stick the flexible straws between and around the items on the countertops and in the drawers. And then I just threw it in the sink and cleaned it up! Cool. Genius cool.