Greetings Oguruma: If your primarily interested in making and keeping your knife sharp with the least amount of complications, get a Sharpmaker. It provides the SHORTEST learning curve and LEAST opportunity to screw up an edge. It is probably the EASIEST to use without prior sharpening experience. Another plus is a Small foot print, no oil, no water, no stone dishing no break in period no dislodged grit or dust. Even many who use other sharpening methods still find the Sharpmaker excellent for maintaining a sharp edge. It can also be used to reprofile but is very time consumptive. The Sharpmaker is however limited to two preset sharpening angles of either 30 or 40 degrees but you can adjust for more. Used as per the included video and printed instructions it will get the job done and produce a consistently even and sharp edge. At about $50.00, it comes with medium and fine grit ceramic rods, a case/base, hand guards, a DVD and instruction booklet. OldDude1