Benefits: Fewer engine movements, eliminating stress on the engine top mount. Slightly better handling. Very easy to install once they are pressed into the factory bracket. Cons: Increased vibration, especially between 900-1100 RPM and reverse. It's annoying when the car stops and gets stuck in traffic. Bottom line: if you have power upgrades and need stronger mounts, you probably won't be interested in increased cabin resonance, so this is probably for you. For daily drivers who value quiet and comfort, don't install them. I removed them and went back to the factory mounts. Smooth as butter. Did I mention vibration amplification?