I've tried two coffee flavors.
Clever Vape's Bean Me Up - Strong black coffee flavor. Smells great, tastes good... mostly. But I find that if I vape too much of it it seems to acquire a "fishy" flavor... maybe it overheats? In any event, gotta switch tanks to something else at that point.
Steamy Vapor's Morning Joe - This has more of a nutty flavor to it, and reminds me more of coffee beans than actual coffee. It's good, but not quite what I, personally, was looking for.