My v5 sensors seem to 'sleep' pretty heavily. The older models would respond to slight vibrations and were perfect for chairs, washer/dryer, door knocks, etc. I set up a little app before where I could spin a multi in a circle like a knob. I think ST even made a promo video with just that use-case.
V5, does not report active/xyz until you slam it pretty hard, then it will feed real-time data with great accuracy. Once it goes back to sleep, it takes another heavy slam to wake it up. I have one on the back of my computer chair, and I have to actually punch the chair to wake it up, then it detects me moving around. I'm not sure why it's so much less responsive than the old ones, other than perhaps they were trying to improve battery life. Not a trade-off I would want to make myself.