I start with the negatives. I believe that a plastic piece, no matter how useful it is, could be cheaper. Also, nothing prevents someone from stealing it. Other than that, if you have an automatic machine without a parking brake, the Ariete Lever Lock is a lifesaver. I live on a hill with steep slopes. I was tired of making a whole operation just to be able to park my Beverly without fearing that it would roll downhill with a simple push or a gust of wind. Installing it on the brake lever is a matter of seconds. The same goes for removing it. It is also very small and does not take up space. I highly recommend it to those who have no other way to secure their machine on downhill slopes.