I have one and find it very easy to use. The coarse adjustment is the big knob on the left,( lets the shellholder bar slide) the fine adj. is done with the knurled rings on the cutting arbor (right beside the crank handle) I can have my length in five min. or less and it will hold +.001 to -.0005 with no problem. Until it gets dull, then it's hard to trim with. The cutter should be made from carbide, it would be a far better tool.
Owning a small machine shop business, I can easily re-sharpen mine when it needs it. Hornady will cheerfully sharpen it for you, for a fee.
and who needs the loss of use during turnaround.
The tool is a good design, basically, but the cutting arbor needs to run in bronze bushings and the cutter needs to be carbide. Some time ago I spoke to Hornady about a carbide cutter and they told me that they didn't have any plans for a carbide cutter.
It was about 700 cuts before mine started "rolling" brass instead of cutting, not very many, IMOP.
I still like the tool, I can hold it down on my bench with one hand and turn the crank with the other.
"One Day" I am going to build an "improved" version for myself, to address the shortcomings that could easily been eliminated.