After purchasing the Interact Tremor Pak, from which I was very disappointed I got a Sega Jump Pak. What can I say about it? Its simply the best Jump Pak around, PERIOD....NO, its not up for debate...just accept it! The Sega Pak has a moderate amount of vibration when it needs it and has a nice but managable amount for serious action. This is simply a good product to have and by far surpasses the Inter_crap Tremor Pak.