Curls
Journeyman Pro
nothing but the top of a plain white ball
I'm you you Fader, I tried with the lines but thought them a distraction. I like the bare top of the white ball, reminds me of my head.
My buddy uses the alignment line to good effect but when he's off the green and wants to putt he's useless, relies too much on being able to rotate the line and when he can't loses confidence and aim. Guess it horses for courses but I never felt like I could get the line thing right quick enough, would have to replace and rotate it, too much hassle.
Whatever works for you as long as you're not taking the proverbial with the amount of time you're doing it.