I initially bought an RM1 from DSG when they were first released to see how it compared to my SF mini scout.
The one I received left me feeling "meh" about it. There was flickering with minor bumps and bangs and after a month, the light was draining quality cr123's in less then a day just while sitting in a rack.
Finally got around to sending it in and SL was excellent about a quick replacement. The second RM1 I received has been excellent. I bang on it, It's fallen out of the rack, one day doing some active shooter training, I took a turn through a tight door frame and smoked the bezel on the door frame, etc...
I've got it mounted on an ALG EMRv3 in an arisaka mount using their supplied switch.
For what it's worth, I've broken Surefires on my duty guns too and while this SL needs further time to be eval'd, I'd say it's promising and definitely a solid, economic option compared to the SF.