I give 1 star for several reasons.
1. first time I order brush can't fit in my machine. I used to buy from other place and have no problems with it.
2. Waste my time to return to first one at store.
3. second time I order it, package is open almost half way.
The reason I order from target second time because it iRobot parts so I think size must be more accurate than the one from no-brand.
Average rating for iRobot Roomba 780 Vacuum Cleaning Robot: 5 stars
this thing is awesome. I love that it can go from carpet to tile to rug. no problems. we program it to run every night during prime time tv and it's not loud at all. Definitely beats bringing out the conventional vacuum.