I watched the DVD twice, spent hours with the instruction book attempting to sharpen knives. To date number of knives successfully sharpened = zero.
I had previously used a cheap Byers brand knife sharpener (portable fixed angle type). This takes less than 30 seconds and works! You just draw the unit across the blade 3-4 times & you are done. Now it is by no means scary sharp. And experts say this type is garbage. It does allow knives to shave paper from the edge. Probably only a utility edge. Step two of four when using the Spyderco Tri-Angle SharpMaker 204. Well I am unable to get even close to shaving paper with the SharpMaker. Despite MUCH more cost, time, trouble. I do not disbelieve that other knife enthusiasts and experts get great results with the SharpMaker. I just flat out do not believe it is either easy or simple. I think it takes skill.
I tried a variety of plain edge knives & 2 serrated knives. (None of them terribly dull, but not sharp--they can all cut paper IF I poke the point through the sheet & then cut) I did NOT try it on any of my Spyderco knives as I didnt want to ruin them with the SharpMaker. Besides, my Spydercos are still (relatively) sharp. (They all shave paper)
I have yet to try using a permanent marker on the blade edge or a mirror to somehow check to see if I am holding the knife vertical. I will probably try these things soon. (THIS is ease of use, LOL) This surely would never be in the manual or no newbie wold ever buy this! When Sal sharpens on the DVD it looks so easy. It is not easy for the unskilled. Im sure an expert can make using a cheap whetstone & oil look simple. I havent tried to sharpen my dental tools (just kidding) or the array of other strange tools nor will I ever. I did try to sharpen a nail clipper--seemed easy. There was absolutely zero effect on the clippers. But, I didnt buy this contraption to sharpen nail clippers, or shop tools, or dental instruments. I bought it to make plain edge & serrated edge knives very sharp.
I DID rub the edges of the gray, medium grit stones over each other & same with the flat sides several times to break it in as Sal said on the DVD. I am doing 40 strokes medium to light pressure (20 per side) for each step. I am using the 40 degree angle (not the 30 degree). I have NOT tried the Back Bevel pg. 6. Since I dont know that all my knives have been over-sharpened & need to have the shoulders removed. I dont really know how I wold be able to tell. I really doubt that is the problem on all my pocket knives & kitchen knives.
I dont know if the 40 strokes per step is wrong & I need to do 80 or 200 strokes.
Some posts say to not move on to the next step until & unless the sharpness is tested for the prior step. This makes sense. If you cannot shave paper after step 2, going on to step 3 may be worthless.
I would certainly not have purchased this tool had I known it would not work without considerable expertise. Not a happy customer.