At least it has two constant angle options. But what's the grit size?
On my cheaper knives, I use a Jewelstick with 600, 1000, and 1800 grit sides... and I can get a functionally sharp blade.
On my better knives, I use stones starting at 1000 and going up to 15000 grit. In between, I'll strop on leather with diamond spray. Most of my Japanese knives are at 15*, one at 18*, and one 10* on one side and 13* on the other. These little guys make it easy and are cheap.
And on days when I just can't hold things steady, I use an EdgePro Apex
Some obsess over cable risers, then there are those that sharpen knives.