The Work Sharp knife sharpener is flat out amazing. Anyone can use it. It is fast and works great. I use this sharpener on a weekly basis sharpening everything from my hunting knives to my fishing knives even our kitchen knives. It truly helps as a outfitter to keep my knives super sharp all the time and it works fast.
You can adjust your sharpining angle in about 1 second. Change the grit of your belt in about 15 seconds. What more do you need.
When you buy the Work Sharp MK.2 it comes with everything you need 3 different grit flexible abrasive belts 2 sets. That will last a very very long time.