Rain2 on 18 January 2016
Out of the ones I've owned, Wii Balance Board takes it. I still use it every now & again just because it's around and the bathroom scale broke 
I've never had Kinect but have tried it and believe it to be the most useful peripheral released so far. I'm a fan but never had an XBox to use it. Too bad they disowned it
PS VR could out due either tho if proven to be fun / useful. Still extremely hesitant about it
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