The flavour it produces is absolutely stellar. Another good attribute is that it is simple to clean. A little ISO to the glass and it shines right up. Most people start with it too hot thinking they'll get a huge rip by doing so... that's the mistake I think a lot of people make. I start mine at 385°F for cured herb held at 62%, and seldom raise it. The only thing I dislike is the proprietary battery. I highly recommend picking up a backup battery if you decide to purchase one.
With all that in mind, I will say this. The AirVape Legacy Pro is very close with the Firefly 2+ when it comes to flavour. IMO the Legacy Pro surpasses it when it comes to consistent, efficient vapour production.