well, I've been playing with mine a bit more lately. I have no way of testing the brightness, but the amount of light coming out is reasonable to my expectations.
I do find the beam profile to be interesting in color. I bought the cool white version. the hot spot itself is cool white, but there is some creaminess of a neutral color around the hotspot, and then it is cool white beyond that again. I do not find it distracting, just an interesting tidbit.
I do recharge it often since I have micro usb everywhere. I don't find the cover difficult to remove, I usually just swipe my thumb across it, and it opens up easily enough.
The text printing wasn't perfect, but I use my lights, which means I drop them, which means they do not stay in pristine condition for very long anyway.
I actually use firefly the most since I use the light as I go around the house at night checking doors and the like before going to bed, and it is one feature I appreciate from thrunite from all the lights I've bought from them.
This light definitely gets warm quickly on turbo when I've played around with it. It is also considerably bright for its size when run on turbo. I don't find turbo to be that much more useful than high in most situations, but I definitely play the most with turbo. There is a significant difference in brightness, but at short distances it doesn't make that big of a difference. I use it in candle mode to light up a full room, and it works well for that, though it does get fairly warm on turbo when used in this manner.
This has quickly become my favorite light to carry in a jacket. I appreciate the form factor the most. Previously I used a TN4A Hi in my jacket pocket which I liked already - previous to that was the mini TN 30 which is enormous compared to these in a jacket pocket.
It is a great general use light for me, and I expect to use it for quite a while. It really does hit the right balance of factors for me in terms of size, brightness levels, ease of charging, etc. I have become a big fan of 26650 lights ever since my first 4sevens S12 and X10 which have been retired for a while now. I also have a convoy L6 which uses 26650 batteries which has the output as the TC20, which just astounds me considering the size of the TC20.
If you can't tell, I am quite happy with the light. Though, admittedly, I am typically quite happy with my lights when I first get them. I appreciate the advances each time I get the newer one (though with how bright and efficient they have become, I don't buy as often as I used to when things were changing so rapidly - anyone remember the Nuwai Q3?)