Everything except the negative contact of the driver and tailcap MCPCB made without tightening rings but directly on the MCPCB trace. It’s the cheapest and least durable type of contact.
My favorites are the Emisar D4 and Astrolux S41.
What I like about this primitive design of tightening directly on the trace is that if you are concerned about wear, you can just apply a thin layer (or a few dots) of solder on the trace that takes years to wear, and if it is eventually gone just re-apply for the next 10 years.
Isn’t this a design choice? Wouldn’t retaining rings add total length to the design? And although I do enjoy a durable design, one can question how long it will take to completely wear the traces. If you look at the original Skyray King, then the button top cells would even rub against the positive trace when tightening the battery tube. You don’t even have that kind of wear sensitive action in the D4.
If it works, don’t fix it 
and it seems to work fine in the D4, and when the trace is almost gone (in 1 year, or 5, or 100, who knows?) you can still add some solder.
Who knows maybe in the near future you can just cheap 3D print a copper trace easily. :sunglasses:
I have mine manker e14 II if that counts? not that big even with ext tube for 18650 and throws alot of lumens.
Am I too far behind the times or am I allowed to still really like the BLF A6 with an 18350?
Currently a Jetbeam Jet-II Pro
Jetbeam Jet-II Pro really cool, my friend bought it yesterday, shure i will buy it 2
You are right, that still is a great pocket rocket, especially now it can be upgraded with an Aspire 18350 battery!
I still build lights with the BLF-A6 driver because it is an affordable well-proven well-working driver with a fine user interface. It works good with a lighted tail as well (unlike the BLF X6/X5 driver)
TX25C2vn XPG2/DD/Single mode- 900 Lumen/80Kcd.Field tested 80Kcd….at least 70Kcd to 75Kcd ANSI.
Enough output/PLENTY of throw and manages heat much better than D1/D4,as you would expect because of size to output differential.
The D1vn would qualify also. Just not for me as I returned it because I demand my lights to go on MAX for at least 5 minutes.
To be expected, after 90 seconds you could not even hold it,unless you were holding it by the tail cap!
I believe it essential and part of the definition that a pocket rocket takes seconds to overheat and burn your fingers :partying_face:
Are we talking about pocket rockets or pocket Prius ?!
Come on, if it doesn’t burn my fingertips in less than a minute it’s tame :-p
EDIT : oh BTW, I consider the S-mini a pocket rocket and in the same way a practical EDC.
D4 with short tube.
Flashlight aholics dream last night, the power went out prepping to go trick or treating. Handed out lights to everyone. The two smallest kids got a Thrunite TN-12 and a generic “1,000” lumen POS with zoom (I call it a POS, but after I fixed its issues, it’s been the longest lasting light I own, lol). So those two lights are instantly on high bouncing all over the house and outside. They are practically useless. Walk in a room with the D4 and set it down on the tail cap and it’ll light up the whole room. Outside, just nice wide light. amazing. Turbo on my dark street was lit up both sides of the street nicely.
My most used light is still a Convoy triple XP-L. I have a D4, and the UI and output is amazing, but the Convoy has a pocket clip. Oh no, I just realized I’ve become one of those pocket clip people.
Hahaha is that the final level “the pocket clip people”?
I already accomplished Titanium fetish, ui freak and tint snob. But still not quite ready for pocket clip people, so D4 is my choice. I would kill for a titanium D4, not practical, but who wants that in a pocket rocket.
Emisar D4, end of discussion.
That is a bit narrow minded, isn’t it!!! 
Maybe, but it is that good.
(I have many more other lights that I also enjoy. :cowboy_hat_face: )
For a few seconds… and then it’ll ramp down to what… maybe 300 lumen?
Whereas a light like S2+ still fits in a pant pocket and can maintain close to 1,000 for pretty much forever.
But yeah, neither the D4 nor the S2+ were designed to be table lanterns.