Starchaser,
The Razor's Edge kit is good for beginners who want to learn the strokes of freehand sharpening. All the guide does is keep your hand at the same angle, you still have to go through the same motions. Eventually, you will put less and less pressure keeping the guide down on the stone, yet still have it on there (same angle, just more freehand and less guide work). This will gradually lead to you naturally getting a feel for freehand sharpening. The instructions also show you the concept of the burr and all that other good stuff. I would recommend it for a new sharpener. However, I already knew freehand sharpening (many years of practice on the stone, sometimes I would sharpen just for the sake of sharpening which meant hours at a time on the stone practicing). When I got my Razor Edge kit, I wasn't too impressed with the ultra fine stone (wasn't really very fine). I got much better results with other stones, and so I returned my kit and got a refund minus the shipping. In my opinion, the Razor Edge kits are for beginners as they don't give you that fine of an edge, but will give you good practice real easy while giving you above average edges at the same time. Make sense at all?
If I didn't already know the important concepts of sharpening (raising a burr, rebeveling, angles, different degrees of polishing/coarseness, etc.), I probably would have loved the Razor's Edge kit, but eventually, one must move onto finer stones than the Ultra Fine piece they give you. I got nice results by stropping with rouge after the Ultra Fine piece, but it didn't quite give me the mirror polish I wanted/expected it to. Hope that helps, you can e-mail me if you want more of my opinions on sharpening systems. echang@uni.uiuc.edu. I've owned/used quite a few sharpening systems (Lansky Deluxe with upgrades, Smith's Precision Kit, various crock stick pre-angled things like the Sharpmaker, Edge Pro Apex, and various freehand stones).
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Chang and the Rebels of the East
(Southern Taiwan Shall Rise Again!)