I have one. It is okay. Seems like it is probably a better idea than the end result is for me. I have started a few fires with it. Mine was a cheap one off Camofire, there could be some better ones out there for sure.
I have an RMEF one I got several years ago with a membership, I use it on every trip I go in with my goats! Used it on every trip the past 3 years. I like it, starts a fire in any situation with vaseline covered cotton balls.
Matt