As
@Wingsfan0310 mentioned, I do in fact have the Therion and think it to be a great mod IF you plan to vape within its limitations.
I use it for low to mid power of no more than 55W. Above 60W, you are really pushing its upper limit and is not efficient. This seems to apply to all DNA75 mods. Also, in TC, my preferred temp of 500 does not see to be a match... upper limit ceiling again. I use it in wattage mode with my Tornado and soon Mage (arriving end of week). It makes for a powerfully compact mod
I only need 50W for 24G SS build that I have loaded in the Tornado. Tons of flavor/Vapor.. it's my favorite tank atm... that's another story though.
Now, with all that in mind, if you are considering a DNA 75 mod, I can't think of a better one. The form factor is great. Its a bit smaller than the VT 133 and is quite comfy to handle. I am now using it for travel bc of its form factor! Beyond that, its a sexy device IMO.
What specific questions did ya have? I would be happy to help