Yep, I still keep one in my car and I really like the classic design. But I keep a FC11 too, because sometimes I need light. I even have a diffusor for it so it can be used as a table lamp.
But Maglites sell on reputation. They used to be the best but didn't go forward at all. All of their emitters are ancient tech by now. But they advertise it as more "reliable" - but the real reason is it costs them nothing. No R&D, no modern emitters just the old cheap ones, they don't even use lithium batteries. Try using one of those ******** lights and they'll simply blow the Maglite away. For example, a
Convoy L6 compares well to the 4D. But its 2/3rds of the price, at least twice as bright, high CRI (I think Maglite is around 80, not terrible but high is considered above 90 - CRI is one of the most important specifications, it tells you how correct the LED light is so you actually see the right colors, I think it is considered in comparison to incandescent which would be 100 CRI). It throws light further...
But most of these things are just because the Maglite does not use lithium batteries. Alkaline batteries just can't compare, they can't supply the current and they store way less energy. If you fit a lithium battery in that same maglite, it'd already perform a lot better. Then put in a 10$ emitter instead of a 2$ one and it'd be comparable and they'd still have a massive profit. It's a shame they're not going forward...