Mines an early V10R - it has a lower low than current models. The difference is not magnet alignment, the mechanical alignment is handled by the same aluminium part in both torches. The problem is fundamentally based on the circuit, primarily a software issue with the ramping behaviour (rate was too fast/range not big enough).
Just compared the V10R against the lowest mode on a Novatac 120P. The 120P is meant to have a low of 0.08 lumens!!
Interms of Usability, LOW lows are useful if the UI can back it up IMO.
The novatac low is a very usable low, I can find my way around the house very well, and not lose my night adapted vision, and I dont feel that I need to cover the head of the torch. To me it's about right for a UI with 4 modes.
The V10R has an AWESOME low, but what matters is the variable ring makes it SUPER easy to control the brightness, so its really easy to just tweak it up or down fractions of a lumen to suit the situation (such as looking very close, to the wall at the end of the room). For this reason, it feels very functional, and is Never a hinderance, theres never the feeling that its too low because its easy to adjust.
The D10 doesnt have as low a low. A little too bright for night adapted close reading, but otherwise a very nice general purpose low. The key here is that the ramping interface is too fast (not very controllable) so its not possible to adjust to a slightly higher level, you end up jumping to a 10 lumen level all the time, so the minimum level of about 0.7 lumens (referenced to 120P) is a very practical low. Any lower would be nice, but would start to borderline annoying.
The Maratac has the highest low level of all the torches in my pics, I do feel it could be lower, but its not something thats really annoying, its still a functional low level. As a Twisty with only 3 modes, Its a brightness level that is understandable and acceptable. Referenced to the 120P, its about 10+ lumens.
So I guess it all comes down to the UI. Low Low Lows are really nice like in the V10R, but in a torch with just 3 modes, its not practical to always have that low a low. From my experiences, I would call an ideal low for most torches to be in the 0.3-1.0 lumen range to suit my needs. If the UI supports it, I would happily accept a lower low.