'The feel of the ball in your hand' seems to be a bit of a flaw for me.
When sleeping with the ball, the feeling in my hand goes numb (SP) and thus I don't feel it, and don't dream it.
The sensation of throwing, or yo-yo-ing might still have an effect, but that's more akin to MILD, and an externally triggered DILD.

The NovaDreamer is basically the same as this, but for the sense of sight. In my opinion, this ball needs to move, or produce a sensation, from time to time.
Eg. a timed mild shock on the finger makes more sense to me, but what worries me is that when I'm lucid, a shock to the finger will probably wake me

Any advice for this?