The water drip sound was so loud before that it would wake us up from a sound sleep and keep us up -- not a problem anymore! It cut down high-decibel water-on-metal pings (from AC units for 7 stories above us) to a mere whisper when the room is silent and inaudible when the AC or a fan (or just about any other noise source) is running.
The magnet *appeared* weak to me, but works perfectly. I had to cut smaller strips for side-coverage as our AC unit is large and I used a few spots of Gorilla Glue to ensure that the small strips held.
Pros: Easy to Install, Easy to Move, Good Size & Weight, Effective