I read all the reviews for this product and many others like it prior to purchasing. One review that stuck in my mind mention in all caps several times the you can cut your finger off. I must say you would have to be some kind of special idiot to cut your finger off with this machine, it's possible I guess but you would have to be trying.I could not be happier with this. I cut hundreds of stacks every week, a stack of 300 is effortless, have not tried 400 yet but do not expect a problem. I have been using a paper trimmer for a couple years now, actually 4 of the same model because I had to replace it every 6-12 months, at $40 each they cost more than this unit and only cut 15-20 sheets at a time.Worked perfectly for me right out of the box, no adjustments. Directions are minimal but really how much do you need to know, I was up and running in 5 minutes. I do not have any reservations recommending this unit, top notch!