maglite be very high quality light that be very reliable . however something like a 4d maglite be extremely bulky for the light output that be achieve . the capacity of the d cell just give really long run-time rather than more output . after a hour of use the output have already drop by 50 % . the majority of the run-time be below 50 % . I would much rather have Maglite use a brighter bulb and have less run-time . it do not do much good to have 10hr of run-time if the light have really weak output for 90 % of the runtime . a surefire g2 for $ 36 be about the size of a Minimag yet actually have more output than this 4d maglite . I just can not stomache use a light larger than a 2d maglite . I stuff the mag lead module in one and now I can justify have such a large light . it run at 50 % of its start output for about 20 hr now . with the mag lead module , the 2d be put out the same output as the stock 4d maglite and have more useful battery life . the 4d maglite be obsolete by my standard . way too big for what you get . I really like the c-cell model however because they have the same brightness but be smaller and use the battery more usefully . haul around 4 d-cell for 10hr of useless light be not very useful in my opinion . I only use Maglites to modify and create some awesome light . in stock form they be pretty sad . I have a small Princeton tec that use 4aa battery which be as bright as a 4d maglite and completely blow away a 2d maglite . it only weigh 5oz . as well . maglite would have a much better light if they simply through in a textured reflector for a smoother beam . after use Surefire and Streamlight flashlight I can not get over how terrible the beam be on maglite . one thing I can say be that although maglite be extremely outdated they be very durable and reliable light . I have never have problem with any mag product I have ever own . they be tough and will put up with abuse . they have be pretty well beat out by Streamlight for Law Enforcement use . a small Streamlight Stinger weigh 1\/3 of what a 2d maglite do yet have twice the light output of a 4d maglite .