I've only done a couple projects so far and it's going well. The grease issue seems reduced to a normal amount compared to other comments. Mine came with the guide bar uninstalled. So far the guide bar is my only complaint. I tightened the screws quite well, but during use the bar gets knocked out of alignment even though I wasn't slamming the paper into it. I'm hoping once I get an angled tool to hold the screws in place while tightening the nuts this problem will be solved, but I can't use a regular screw driver due to the lip on the part (no access to the screw with a normal vertically held tool). They provided three alen wrenches and a double sided wrench already so I'd pay another dollar for them to provide an angled phillips screwdriver also.
Something to consider, the operating lever requires a fair bit of head room / vertical clearance. It will not operate on a counter which has cabinets above it at a standard height.
I say, "needs practice" because if you're just eyeballing the cut rather than using a measurement, it's not super easy to tell exactly where the blade will come down. That being said, I didn't ruin my first product after only doing 2-3 practice cuts so I'm happy with the slight variance and that should diminish as I practice. First project was cutting 70 sheets of 110lbs cardstock and it was super easy. I had no difficulty cutting through the stack. Does small trims easily and cleanly as well. Second project was 100 sheets of standard printer paper (20lbs?). Took me less than 5min to get my 200 half sheets plus trim the other lengthwise border off because why not, I could now (3 cuts total).
Paper Cutter 
