I have to try one. Most lights I've used break on me. Bodies have broken, or electronics. Surefire and Streamlight included. Malkoff so far haven't.
I'll warn you; I was a bit underwhelmed, especially considering their cost. They ARE compact and efficient. The complaints about the UI are something to be mindful of. I'm ambivalent, but it's not my favorite UI. It's just mostly needlessly different, so if it's not your primary light, it always takes a moment to remember how to work it.
The ONLY light I've bought that didn't work out of the box was a Zebralight, and their customer service was atrocious to deal with. Last year, I did re-buy the AA headlamp, and having one that works, it's not bad. For half the price, I think the Skilhunt H150 is much, much better, and durability is less of an issue for headlamps.
Some people complain about the UI in that they don't like the modes, but some also say it's kind of glitchy. That latter issue, I'd agree with. Sometimes, they just...act up, and you have to unscrew the tailcap.
For efficiency of an AA light, I just use a Convoy if I'm worried. For durability, I just use a Malkoff. Zebralight DOES kind of bridge that gap. It's at least as efficient as the Convoy, but more durable. It's nowhere near Malkoff durability (ZL may be potted, but they're single springs, and parts are NOT user replaceable) or quality (ZL is at the high end of Chinese quality - not quite up there with Weltool [who also uses double springs] - but still clearly Chinese)- and they're not entirely cheap, which is the main advantage of Chinese lights. No light is perfect of course. I tend to HEAVILY favor durability, and efficiency is a low priority for me (cause I mostly use AA lights, and bringing a spare eneloop or two is easy enough). If you MUCH more prefer efficiency, I think you can make a case for Zebralight.
I tend to think the ZL durability is oversold. I think there's the realm of "I drop things a lot" durability, and then there's the "I use things a lot" durability. I think ZL is an okay candidate for both, while Malkoff is REALLY good in both (double springs, replaceable parts). I know, I know..."Cavers." But also, if you use headlamps frequently, you'll notice humans
naturally don't slam their heads into things. Your natural instincts to protect your head extend to a headlamp...which means headlamps tend to really outperform in "durability" versus their handheld counterparts. If you poke around, there are whispers of ZL denting batteries with drops (single spring problems) and/or dying from drops because the battery can bonk the board. Malkoff has the absolute tops in customer service, if you break something, you can probably field repair it if you brought spare parts (which are small enough to do so).
For me, I see efficiency needs as "I NEED this light to work," which immediately makes me choose a US made light, instead, and just bringing a spare battery. Do I wish Malkoffs were more efficient? Sure. More efficiency is always more better. Compact size comes at a cost, and that cost is actually durability. I think Weltool is the only Chinese brand that can really be near the US brands in durability, and you'll not they're a similar size and price. If you want maybe 60% of the durability of Malkoff, but in a WAY smaller package, and with WAY more efficiency, I think it's worth grabbing a Zebralight. If you're expecting it to be a smaller, more efficient, impressive feeling, "just as good" Malkoff, you're going to be disappointed. I think I just had my expectations set really high, because the first modern flashlights I bought were primarily weapon lights, and the MDC AA was the first "good" handheld flashlight I bought, so my floor for "durable quality" was kind of overly high.