A very good thing for practicing, yet you need to adjust vibration settings of your phone as well, esp if you play high tempo as the vibe will be felt less and less (no, I haven't tried Muster of Puppets, but it gets hard to feel it even from 120 when playing 1/16, but also depends on where on your body you put the device)
Of course not suitable for recording with a mics as it generates noise.
Pros:
- adjustable strength of vibration
- adjustable colors (you can turn them of as well, they are annoying to my taste, and I don't look at them anyway)
- saving settings/app sync
Cons:
- sometimes you can unintentionally change the tempo if you punch someone for not following it and you have Pulse on your wrist
- during the setup device was recognized by the app only from 5th attempt
- app can't recognize "watches" if you have BT on, but GPS is down which feels a bit weird to me
Not tried yet: group sync, daw sync
In conclusion I would say that the device is totally worth trying, though you can find that you're not that ok with it and vibe is not strong enough for you - can really vary depends on person and a part of a body - but you have 30 days to return them anyway