For those who are perfectionists, aligning your stem/bars can be a pesky issue. Correcting the miss-alignment simply by loosening the stem and trying to nudge the bars has always been an iffy, trial-and-error exercise. Now, with this straight-edge technique, I can nudge it around during a single session and finally get it right without having to set it, go ride to try it out, then re-set, etc. So for me, it works well and gets a faster, more reliable result than what I've been doing. Maybe others will, too.