The Aura shaker lacks super-human hearing
Compared to other brands like the ButtKicker, the Aura Bass Shaker doesn't "hear" the low, low bass sounds. Its usable frequency range stops at 20Hz (about the same as human hearing) while the ButtKicker boasts a range down to 5Hz. However, most films and games don't go any lower than 20Hz, so in most instances you won't miss anything except bragging rights. HOWEVER that is starting to change. Recent movies, like Cloverfield, have started experimenting with lower sounds, dabbling in bass as low as 5Hz, so if you want to connect with the latest sound design, this might not be the bass shaker for you.