stove top grills
The work about the same for things that you were going to put on a gas grill, and if you make a smokey mess in your kitchen, they flavor is even close. But no -- they do not give the same flavor as wood or charcoal or a smoker. I think they work fine for things that need the grilled texture, but depend on marinades for flavor.
I use the LC grill pan as well as a cast iron one that does not have a coating. No difference in the flavor or texture once you learn how to use each.