Review (1/5): Not well engineered.
(1) The opening to insert your fingernail is too narrow for thicker nails. It opens wide enough for a child's fingernail or toenail, and for some adults, but not for me. (2) It is difficult to to keep the magnifier in position directly over the clipping blades. I tossed this one in our "donation" box and decided to get a higher-quality one (I hope!) with a light in addition to the magnifying glass.