Based on my experience with this Automotive Pulley, I must say that i am impressed by its smooth operation and reliable performance. It keeps the belts on track and runs very quietly which is a definite pro .The installation was quick and easy, and it seems to be holding up well. However, the only con I can think of is that it is slightly more expensive than some of its competitors, but I believe the premium price is worth it for such a well-made product..