2013:
The Firefly Vaporizer from the old FC
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2016:
Firefly2 from the old FC
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2019:
Firefly2+ from the old FC
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The Firefly2+ is basically the same as the FF2, but it comes with an updated firmware package/app update to help heating and battery efficiency. But the biggest change was in the oven screen, which now has slightly more airflow than the FF2 screen.
Firefly reduced the price a bit for the FF2+ model which is great, but it comes at the loss of a spare battery, a second concentrate pad, and the brush and pic.
You can send in your FF2 to have it updated with the new screen and firmware update, or you can update the software/app yourself if you do not want to spend the $30 or so to send it back to Firefly for the full update with newer screen. (most can notice a difference in the draw pressure, but some can not).
For best use, this vape requires a slower loner draw than most other vapes. The heater will stay on for 26 seconds at a time, you may or may not need that entire draw time to get results depending on your heat settings and what you are using in the vape. A general place to start on temps is 360F for flower and 470F for concentrate pad use. When using with flower you will have better results stirring and not using a fine grind normally. Using whole buds can also help with reducing the buildup of reclaim. The vape shines when using concentrates with the pad. In fact many still use their FF2's only for this reason. Pressing flower and then using with the FF2's works very well. You can reuse the pads a few times before you will need to clean them. Soaking in ISO is recommended, you may need to let soak for longer periods to let everything breakdown and release from the pad. Use a small container and try rinsing and re-soaking a couple times for best results. You can torch the pads...but then tend to not last as long that way.
With convection heating that is on-demand, the FF2(+) are great vapes with cool vapor paths and the ability to do both flower and concentrates on the go.