They are good to have, but mine cannot thread needles with tiny eyes, which is what I use most of the time. I was strongly encouraged to use it when I do machine embroidery, which seems like a good idea, as there are a lot of thread changes. However, my needle threader likes to shred the rayon thread, so I thread by hand and will continue to do so as long as I can see well close-up. If ever I cannot see well enough to do it, I will quit buying needles with small eyes in them and use the needle threader.