Wow, what a difference! I could tell almost immediately that stopping power increased. Also, it stops much faster and smoother than OEM rotors. This kit is a very reasonably priced alternative to OEM. The pads are great as well. They have been on my car for about 3 weeks now and I have noticed very little brake dust on the rims. Customer service was great and I had them on my front porch in 7 days.