I just received mine today.
I installed the digicue into the larger rubber housing, slipped it onto the butt of my cue, turned it on and it vibrated.
Then I tried some really bad strokes and I can't feel any vibration.
It will vibrate if I strike the butt of the cue with the palm of my hand.
I tried all three modes and I can't get it to detect a bad stroke.
I discovered that you actually have to strike the cue ball before it detects a bad stroke.
I was hopping it would detect practice strokes without hitting a ball because I don't have a pool table at home.
So I practiced a few strokes on my bed with a cue ball and no chalk.
Using only center ball shooting the cue ball into a pillow.
My normal stroke did not set it off on levels 1 and 2.
On level 3 any time I stroked harder than soft, it vibrated.
I try it for real tomorrow.