I have some visually problems and absolutely love having this feature. And now, would not want to be without it.
ditto to the suggestions!!
Another hint that hasn't been mentioned ...... be sure your needle is in the "home" position, meaning the position it is at when you turn the machine on. That's where the threader is set to line up ... just as it needs the needle in the up position.
Many of us move the needle for various reasons ... and no, the threader will not work when the needle is not in it's auto-position.
Once you figure it out, you too will be in love with this feature!