I just bought one for Joy (the sceptic). Well, after wordwork gymnastics repairing a chair I decided I would be the guinea pig. It certainly does the trick. I have yet to try the heat spots and in the car (cigarette lighter connector provided).

I think I will take it to Bedworth and use it on the way back (pun intended).

AND it adds a bit of tremelo to singing practice.

Any experience of these things?