Electronic clip on tuners have been a godsend to me. It means I can get in tune much more quickly, especially with friction tuners on my ukuleles. I always check by ear, though and if it doesn't sound right then I tweak. Years ago when I tried (unsuccessfully) to learn guitar, tuning was a frustrating exercise and always took ages. It was one of the factors why I gave up.

I can't see the point of an automated one, though. I suppose if you're a big name band are going to use several guitars during your set, the could save some time ensuring the basic tuning is right.