I take pretty good care of my e-cigs always have, but the problems I've had with the Therion BF's thus far.
2 units, the display stopped working.
1 unit, the most recent reads battery fault whenever you trigger the fire button. It's not a battery fault, since I get the same behavior with the same batteries on another Therion BF mod.
I do notice with heavy use that sometimes the bottle leaks, either because i didn't reset the tube,didn't replace the tube soon enough (yes, that darn tube needs replacing if you use the device as much as I do.), or if i forgot to twist the vent cap after refilling.
I do tend to need to replace my battery 3-4 times a day. So that's a lot of wear on the bottles tubing.
I did just order one of the Hotcig RSQ. I also still have 4 Therion BF's on standby, I purchased a bunch of them when my first ones screen went out. The problem with the Therion BF is that it's a limited quantity device, it's already very hard to find and I doubt Lost Vape will be producing more anytime soon. I guess being a former heavy smoker, replacement of my device is very important to me. The ability to at anytime order another one needs to be key with my vendor. Something I didn't realize was going to be a problem.
Also I do own a Fuchai 213, decent mod, the board seems to read high on the resistance of coils, and the inability to modify the resistance except through a fresh "read" is annoying. Love the battery access though, unlike the therion where you have to remove your bottle to get at the dang thing. Nor does it chew up the battery wrap because of the mechanical reverse battery protection.
I keep debating on the Boxer BF
Boxer Mod Classic DNA75C BF 2X700 Box Mod | Squonk Vape Device but I really don't like that it doesn't have a battery divider. Mod looks solid enough though mechanically, and I'd probably miss the quick refill that the Therion offers, unless the lost vape bottles fit in there. And of course the bottle opening placement is not optimal.
Some of the things I don't really like a lot about the other Box mod BF's are, bottle placement. I think the Therion is spot on in having it at the end where you can squeeze while vaping or just prior without having to move a finger.
Battery placement, everyone except a few mods seems to like to put the battery in the way of the bottle.