I've had a DM70 for a couple of weeks. It packs more lumens into a small space than any of my many high-end lights. And in general, I think Imalent quality is very good. But the light has two problems that I fixed with the same mod.
1. The "on" button and the sidelight look identical and feel identical in the dark.
2. The on button is verrrrrrry sensitive. Imalent support said I can lock it with 4 presses, but they must be so rapid that it takes several tried to lock it and several more to unlock it.
My fix was to glue a rubber washer around the on button. The washer is 0.87" OD and 0.56" ID. It prevents accidental turn-on and makes it easy to find the on button in the dark.