I shave my face with either a DE or a straight razor that uses disposable blades. I've tried the DE on my head, no bueno.
I've also used the HEADBLADE, it doesn't work for me either.
I've been using the ANDIS electric shaver, but it often misses things if there's more than 24 hours growth. It misses anything too long, so I often find missed hairs where I can't see.