The idea itself is very good. Beam shape is great too. Unfortunately, SF didn't think of what Olight did. This 18650 in its own SF case was designed to operate simultaneously an electronic switch in the head, which needs a permanent connection, and a mechanical switch in the tail. If the SF used Olight batteries with a "-" ring in the head, this would greatly reduce the length and costs, and with a regular 18650 or 2 * 123 one could always use the maximum mode. I didn't like the R1 because in order to use the tail switch with one hand after using the head switch, I had to make an extra movement to intercept the flashlight - it's too long. But in general, it is very reliable. It makes no sense to compare it with modern flashlights in performance, it is too old.
I wrote a couple of letters to the SF about the modernization of the control system. They use a magnetic ring so that each position corresponds to one brightness mode or some kind of blinking mode. If each position of the ring is assigned not 1 level, but 1 work program and combined with the Lawman reflector (he has a very useful beam) and the IB system, add 21700 and a click button, then this will be ideal, unless, of course, add the correct brightness control system.
That is, imagine that there is a magnetic ring with 5 positions, just a thought example:
1 position - high only (stepdown to 60% in 10 sec)
2 position - IB / High (like Fury 1500 IB)
3 position - 0.5%, 10%, 60%, double click from any mode - 100%, no memory, start from low
4 position - High , Strobe on triple press
5 position - Strobe, SOS, slow Strobe, Beakon, etc,,, with memory last regime
SF never answered me, although the letters reached them. They are unlikely to create something like this, since it will kill the demand for the rest of their products, or not, since it will be too expensive for ordinary people))