I, too, am a big fan of Rada! For home kitchen knife work, the sharpener all by itself is absolutely unparalleled, on Rada and other brand knives (Rada knives are awesome, by the way). And all it is is two steel disks.
I used to have another sharpener which ground the edge way too acute. It was frightfully sharp, but it dulled extremely quickly, and the edge even chipped easily it was so thin. That sharpener removed a lot of metal!
The Rada sharpener produces an edge that is very sharp, yet also strong. It does not remove a lot of metal in its grinding. The edge lasts pretty well, too, before needing resharpening.
I bought a nice big old kitchen knife at a thrift store, and my Rada sharpener put an absolutely delicious edge on the thing! I proceeded to cube an entire roast, and the last cut was just as easy as the first.
Skinning older rabbits is one activity that is hard on a knife. We used our Rada knives, sharpened with the Rada sharpener, our first time. Those bunnies were 22 weeks old when we were finally able to butcher, and the knives had a relatively difficult time getting through the pelt. By the end of the day, it felt like pulling the skin off with our teeth might be faster. So they do have their limits.
After that, we went and bought Outdoor Edge Fish & Bone knives at Bass Pro, for $20 each. They made easy work of skinning, and our rabbits tend to be butchered at 14 - 16 weeks, rather than 8 - 12, so the skin is thicker and stuck.
They did two years of processing rabbits without a single sharpening.
Recently, we processed a litter, and realized that it wasn't as easy to get through the pelts as it used to be. So I took the knives to Bass Pro, where they sharpen knives they sell free for the life of the knife. The man felt it and said, "These feel pretty sharp." I replied, "They aren't as sharp as they used to be; I can tell the difference." So he sharpened them. And I bought a third one (they've gone up to $25), so that my husband could have one to gut and clean with, and my daughter and I could each have one to skin with.
I never use them for regular kitchen work, only for processing. While I can use my Radas for processing, it is easier and faster for me with the Outdoor Edge fish & bone knives.