Never played with aTwisty, but finally getting to mess with a Rotary for a couple of days I see all of that utility in the current twist/rotary model. One 3 o'clock to 9 o'clock thumb sweep gave me most of the range from min to max. A small amount of sub lumen efficiency loss vs earlier designs has suddenly become a low priority to me with this light once I got to see what it could do.
Maybe someone will come up with a spare battery carrier that does double duty as a long running, sublumen joule thief, a perfect 'cake, and eat it too' compromise.
Momentary on, 10 minute shutdown and button lock, these seem well thought out and work perfectly. It could be useful for the 10 minute shutdown to have an easy.on/off like the button lock.
I liked the agro strobe too, plenty good and fast to see by while being no fun at all to try and look through.
Making 1/3 seconds the dividing line between a click and a press gives good flexibility between immediacy and ease of use.
I notice that with momentary enabled, 'momentary on' from 'off' was basically instantaneous.
Turning Rotary dial to full on and pressing momentary was almost indistinguishable from an incandecent direct drive.
Surely there must have been a millisecond or two delay that I didn't notice, but I didn't.
Contrast with when you switch modes with the light already on, discernable lag, maybe nearly a quarter second.
Anyhow, instant momentary full on from off is really nice any way you look at it.