Try Youtube, search for 'Michael Manring'. He is a (not available anymore) Zon signature Hyperbass, with D-tuners installed on all four strings, and uses them (too) often.
I have a d-tuner on all three of my basses, but only on the E-string.

I am very happy with that set-up, and the look on the faces on the guitarts when I use it is just priceless (they don;t know there's a D-tuner for guitar as well.