In its September 1 issue, Cook's Illustrated reviewed apple slicers. It turns out their criteria for an apple slicer is pretty much what mine were --they wanted something sturdy that made clean, even slices of even firm, thick-skinned Granny Smith apples with minimal effort.
Fortunately, their pick is the one I already own--the Williams-Sonoma Dial-A-Slice Apple Divider:
Its wider-than-usual, 1-inch, serrated corer gripped the apple and ensured the entire core was removed. We also liked the comfortable rubber handles and plastic cap that pushes the hard-to-reach bottom of the apple entirely through the blades. (Other models left slices attached, forcing us to push the apple back up, which meant we were handling the sharp blades.)
Good to know my impulse buy compares well. Check out their review.