Well I got the hand clipper in! I love it. The problem I was having with my Yale bump key, was that one of the ramp peeks was lower then the deepest cut, so the ramp was not touching the pin. I hand marked and cut one with my clipper and it worked in 3 tries.
The key marking process was the toughest part, and it wasn't that bad with the new digital caliper. I marked the depth line, then marked each of the cut spacings from my chart, then went to town with the clippers.
I found the clipper very easy to operate, the scored cutting pad did help with making sure the cuts were square. I did notice when I cut a titan KW10 that the key bent a little bit. This is countered either by putting the key in a vice for a little after cutting, or alternating the sides of the key that you cut into. The second choice will require double the time marking, so i just put it in a vice, and that was that. I was going to put an instruction document together, but this item is so simple to use, there is no need. As long as you know how to mark a key for depth and spacing, you are good to go.
Raccoon is right about impressioning, you will need to score the edge of the key after every cut in order for the marks to show up clearly. I do not know if the clippers will make impressioning harder or not. It would be very easy to take too much from the key when cutting by eye. But you can make a cut as shallow as a 1 with out a problem.
OK, now that the excitement is done I have the pictures I promised. Sorry they are a little blurry, but I gave up after taking 10 of each shot, and not getting any clearer.
They are too big to post even after resizing, so I am putting URLs.
http://www.geocities.com/jmac875/HC-Whole-2.jpg
http://www.geocities.com/jmac875/HC-Head-3.jpg
http://www.geocities.com/jmac875/HC-Face-4.jpg
http://www.geocities.com/jmac875/HC-Titan-1.jpg
The last one is the titan I cut by code with the clippers.
Let me know if you need anymore information.