On paper, the Zanfare F1 flashlight looks pretty good. The several styles of knurling/grip do make for an odd appearance, but that's not a deal-breaker for me.
No small tube light can hold a 1240-lumen output for very long, so the 30-second step-down in "Flare" mode is fine. The next highest mode, a 590-lumen "Turbo" mode, is a level that can probably be maintained without overheating.
Overall, the mode spacing is good. It would be better if there were a mode between the 1-lumen "Moonlight" mode and the 50-lumen "Low." Something like 10 or 15 lumens would be nice. Adding another mode, however, might create user interface issues. There are already five different constant modes, four of which are on the "main sequence." Inserting a new mode would make the main sequence longer. My opinion is that flashlights that have that many modes need to have mode switching in both directions, brighter and dimmer.
The recharging port cover is ideal. I have a general mistrust of the tiny rubber flaps used by most rechargeable flashlights. Zanfare has chosen my favorite design, a screw-on sleeve, sealed with O-rings.
The driver is said to be a constant current design that has both a low-voltage warning and cutoff (at 2.6 volts). Nice!
The User Manual does not describe recharging in detail. I presume that 1x18650 is the only battery configuration that allows recharging. Trying to recharge 2xRCR123 is probably not going work, but the User Manual fails to point this out. In addition, it looks like there is a typo in the User Manual. It describes CR123A as having a nominal voltage of 3.7 volts and RCR123 as having a nominal voltage of 3.0 volts. I think those are reversed.
Can the F1 flashlight can take 2x18350?
Based on the specs, I would say Zanfare has done a good job with it initial entry. I hope to see more from it. Models with neutral tint, CCT near 5000K, and high CRI would be of particular interest to me.