Bought this kit to stock up on spares for our i7+. The brushes look and feel the same as the original. If you make a blind discovery, you can never tell which brushes were OEM and which were third-party. As others have said, it makes some sort of noise. Not louder per se, just a different noise than the original brushes. Not sure why that is, maybe minor/small changes to fittings/bearings? However, this in no way affected the cleanability. The Hepa/dust filter has also worked flawlessly so far,