OP updated with new groupbuy codes. The US promotion should be active as of tomorrow, June 3, 2020. Please let me know if you encounter any issues with the promotion.
The manuals in post #2 do not reflect the UI improvements yet. They will be rectified later on.
The item is currently listed at €27.99 pre-discount on Amazon.de. Also currently has a 5% discount option applied at checkout! So with the further 20% code this was a really nice deal.
Last month I picked up the Sofirm SC31b (Kit) on Amazon.co.uk with their code for about £9. The only things I didn't like about that one was the cool-white tint and low-CRI LED, and Micro-USB connector. This one is a bit more expensive (if you can even say that about a sub £25 light!), but addresses all those issued and improves the UI.
Like many other affordable lights not using extra 7135 chips in the driver for lower modes (like the YLP Unicorn) I assume the 2lm min is due to hardware limitations that make anything lower unstable/difficult to achieve. Vs being a conscious decision to make that the min.
I talked to Mark (Wurkkos). He said FC11 is currently being promoted by Amazon DE for a reduced price already (€ 23,79). He offered to provide me with a new code once the promotion has ended.