I think most of the details to answer your question are in this post
basically the new one is fatter, heavier, and brighter, and has strobe
the original is slimmer, lighter, has a pocket clip I prefer, I do wish it had strobe instead of SOS
IF you plan to mod the Original, there are reflectors that work, and they can accept the new driver that has strobe
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me too
I gave one away, Im down to just 5 SIR!
(SteplessInfiniteRotary)
And feel free to share your thoughts on the pros and cons of your 2019 and Original RRT-01 models… Ive only had the Original… its almost a grail light for me…