@Agro
Linear CC drivers will be always best overall choice for small 1-cell lights in 90% of cases, simply because they are very small, cheaper, and have high output power (if you need it). Also average efficiency (from full to almost empty cell) is not that bad at all, for example avg. efficiency with modern low Vf led (let's say Vf=3.0V) is 1/2*(3/4.2+3/3)=85,7% , that's comparable to most switching drivers, and with these new low Vf LEDs you also have full regulation basically until battery is nearly empty.
As you can see, two main advantages of boost drivers(efficiency and regulation) are not that much better after all with today's low Vf LEDs - in real world you got slightly better efficiency, but that depends a lot on current,so it may be actually worse vs. linear at higher currents; and stable currents/brightness during battery discharge, but with all new very low Vf emiters linear drivers can also have full regulation 80-100% of run-time.
So in my book, boost driver disadvantages - higher cost, bulkiness, and lower max. output power for size still outweighs good sides.
Error corrected, thanks!
Bleeding technique on LD-x4 is more complex compared to traditional resistor bleeding, result is 5-10 lower bleeding current (it's like having 4kOhm bleeder without loosing functionality).
LD-A4 has MOSFET on it's own PCB, LD-B4 is used for external MOSFET (very high power dissipation possible).
Switch in ILC-1 module is 1288 OMTEN switch used is all Convoy lights (as matter of fact, I bought them directly from Simon, because there are some fakes), I believe djozz tested these, and they were fine for up to 15A, and many BLF members use them at 6-12A in Convoy hosts.
I put 3A, because I don't know how reliable are those at higher currents (just like LED manufactures have max. current rating for their LEDs significantly lower than what we all use).