I use this in my Remo Practice pad 8", because the Remo head is way too loud. It does exactly what it's supposed to do, make the pad quiet. The rebound is also good, which it does not make a big difference once in the real kit. It was worth the money!
I also had previous experience with this "SoundOff" with a friend's drumkit and they worked pretty well for practicing without making too much noise.
I defenitively recommend them if you want something quick and effective, or just like me, have a less loud pad to practice if you live in an apartment.