Bests & Worsts Reviews from Amazon

The Z-Series X-Acto knife is supposed to be the company's sharpest knife ever. If it is, I'm not experiencing it. I don't see in real-world use that it cuts any smoother or more accurately than the older knife and blade combo I've had for years. Worse, the knurled grip portion requires constant retightening, an annoying issue that costs this knife stars and one I've not had to this extent on any of my previous X-Acto knives. If I had to buy a knife again, I would not purchase this disappointment.