Sharpeners that scrape metal off your blade will ruin it. I used one on a chefs knife for years and ended up with something that no longer touched the cutting board when I rocked it back. It was so bad that I took the knife out to the grinder and cut some of it down to remedy the problem.
I now sharpen with a 3 stone diamond system and a diamond steel. My Solingen blades are very hard and keep an edge forever. I do find that a cheap blade is easy to get very sharp, even though the edge doesn't last.
Brinkman water smokers (elec and charcoal)
Weber kettle grill
Uniflame Gold Stainless 5 burner propane grill / rotisserie
BBQ Grillware upright propane water smoker
A trench filled with wood coals and covered with chain link fence