[Bulls9999]

Well, although I use alignment lines on my golf balls, I don't really 'use/need them' for putts of less than 15 feet. I'm using them for long putts on our greens. The greens on my home course are relatively newly (3 years back) renovated and are all 3-level bent grass greens, about 10 greens have 3-4 feet elevation difference between highest and lowest plateau levels, about 3 others have about ~2-ft difference, and the remaining ones are relatively flat with only ~1-ft of elevation change.

I use the 'alignment line' to help set up and get the intended path out of the way so I can concentrate on speed, which is so important if you want to get within 5-6 feet from 30 feet away with possibly 2 elevation changes of 2-3 feet to negotiate.

On relatively flat greens that I've played on many resort courses, heck, don't need a line on my ball to putt from anywhere.