I have found the incandescent mini-mags to be very reliable, but not very bright. And the bulbs are very fragile. One drop from only a few feet can shatter the bulb in the light AND the one in the tail cap.

The LED versions have been sturdy, bright, but unreliable for me. I have the stock LED mini-mag and the mini-mag converted to LED. Both are bright, but both have connection issues with the LED bulb. That has been my experience. Hopefully they work better for you.

The Fenix lights, on the other hand, have been bullet proof for me. I EDC a little AAA one that is about as bright as a 2 AA LED mini-mag. And when hiking or camping, in addition to a Tikka XP head lamp, I may take a P3D Q5 for throw. And it has massive run time on the lower brightness settings too. Waaaay brighter AND waaay more run time than a mini-mag at about the same size. And for me, more reliable.