I have one. I've used it some. The interface is the surface, which you touch, and the outer dial which you can use to slow down / speed up the beat. You can also connect it to your phone and set the exact BPM that you want. I liked using it better than a regular metronome - I liked the vibration better than an audible pulse. I felt like I had to fuss with it too much to get it to do what I wanted. If it were simpler I would use it more. (It could use an internal display that shows current bpm, set by the outer dial instead of the gesture interface and phone app.)
Hi - Just seeing this post about the Soundbrenner. I can understand why Metal guys wouldn't be able to use it bc the pulse would not be loud enough. However, as a practice tool (solo) I am finding it very useful. It took a while to get use to the pulse versus the click; however, with the app you can make it click too. However, I am enjoying just the pulse. Before I would rarely practice with a metronome b/c I thought my time was decent, but after using this for a few weeks I have rethought that. All in all a great product. I bought mine from GC for $80.
BostonJazz72 , i noticed you put a similar/same response in another thread covering the device. i have a question: did you ever use it while another player(s) also used it --- both of you 'feeling' the same, synced pulse? and if not: do you know anyone who has, and what they seemed to think about its use for a group of ensemble players? thanks, jim.