I had previously only Mini Mag Lites, first with the ever blown, yes after each 2nd battery replacement allowed to replace the light bulb, crap thing and then also with LED, but always had a kind of loose contact and always up beat part somewhere had, so that they shone again until they no longer at work. At that time, about 2 years ago, I have extensively well read on the internet and I came across several replacement bulbs which have for me relevant properties: for example, the shape, type of battery, resilience, things that have always bothered me at the Mag Lite, as Turn to turn and eternal focusing of the beam and the fast zerkratzende plastic lens. I had decided on the E21 and am still enthusiastic about the hammer part !!! Always works reliably, the batteries wear is perfectly fine, and I only use the weaker of the two available lighting levels to 99%, the lens is still not scratched and is still clear as the day! I use them every day to work as a service technician for heating systems and am going to rely on a good and reliable lighting in the workspace. The only thing that does not bother me that the black paint is adopted to slow, but these are normal signs of use under severe conditions, but one or the other scratches does not change the functionality. It is already fallen down hundreds of times me, once I had the inner lid of the "switch part" tighten, because he had loosened and she therefore wanted only light up when I held the button depressed. All good again and I was happy again! Now I have already ordered the 3rd, one for each of my colleagues, who are also very enthusiastic!