The E12C is an interesting, older model that I grabbed because of the combined discounts going on with the "clean sale" and the fact that I could get it with the new FFL emitters.
The switch on mine has a tactile click and consistent engagement, although there is a bit of a ring mark on it, possibly a manufacturing 'defect' although its not super noticeable and I can't feel it with my fingernail.
Physically, a well made light. The approach for hiding the USB charging port is not unheard of in flashlights, but it's definitely not the norm in this type of light. Certainly not as convenient as Firefly's new 2024 magnetic covers. I've also had issues with the oring getting pinched, although it only happened once and the oring was still holding together so I haven't replaced it yet. The light does include plenty of extra orings, so it seems like this could be a known issue.
Another thing to note is that this has had a liquid electrical tape fix applied to the usb c port on the inside of the battery tube. Without this there were some issues of shorts because the battery's positive end could get close enough to touch in some cases. This is good to see, but is certainly something I'd keep an eye on if i were changing batteries a lot, in case it needed to be re-coated due to wear.
Beam pattern with the FFL emitters has a hot spot, but it's broad and transitions slowly to spill which also tapers off gradually. No rings or artifacts, it's a nice beam.
The version of Anduril on here is 2, but as I discovered after research, it doesn't run the full version of Anduril 2 because the driver doesn't have enough storage to hold it. The included version behaved inconsistently with what I expect from Anduril 2 in some ways. I couldn't seem to disable the post-off voltage check and it doesn't have the soft start of newer versions of Anduril 2. Fortunately, I found that lone oceans made their own version of a newer release of Anduril 2 that dropped some features (like tactical iirc) in favor of keeping others and it behaves more in line with my expectations from soft start to being able to configure settings as I wanted. They have those here, if you're interested: https://loneoceans.com/labs/temp/anduril/
At the discounted price, I'd have no complaints about it, and with the alternate firmware I like it even more. I fully expect this to get used and abused and look forward to seeing how it does.