1- It simmers ok, I do not think as well as a dragonfly.
2- It does not light quite as easy as a whisperlite(at first- it is fine now), at first I'd try to get by with lighting the fuel in the top burner, but realized I needed to fill the cup below, and light that.
I bought the stove mainly for the weight loss, I really love it. It simmers ok/mediocre, but I never simmer anyway. AND I cannot stand the LOUDNESS of the Dragonfly