Electric sharpeners are *horrible* for good knives, i'd only use one on knives i don't care about, the Leek is too nice of a knife to use an electric on
an electric sharpener is basically a low-end bench grinder in a small form factor, it scrapes metal off the blade in large amounts, destroying the primary edge and micro-bevel, there's no quicker way to ruin a good knife than by using an electric.....
the Sharpmaker is so well regarded here for one simple reason, it *WORKS*, as long as you can hold the knife straight up and down and draw it down the rods, you'll end up with an exceptionally sharp edge
why not try it yourself, get a couple inexpensive knives, lets say a Buck Stockman or a Victorinox Bantam Swiss Army Knife, get two of them, and a Sharpmaker (or borrow a Sharpmaker if you know someone that has one)
run one knife through the electric sharpener, the other down the Sharpmaker, then compare them side-by-side, perform cutting tasks with them both, you'll be able to see the difference, it'll be obvious.....