I also had an Efusion die about two weeks in. I loved the first one so much I bought a second. The second one never seemed right to me though. When it came out of sleep the vape was always "off" even though I had the same exact settings on both devices. I could plug it up and download the same settings again and it would vape as I expected it to until it went to sleep again. A few days ago mid vape it just completely died. Thankfully Vapordna has great customer service and I'll have a replacement soon.
I'm pretty sure they ship with the default settings. I got my second Efusion in and I checked the settings before I updated. It showed "0" on the mod resistance and "150,150,10,12,-20,110" for the box settings which is what my first one defaulted to.
I got my Efusion in and it feels solid. Unfortunately my device will not charge, I hooked it up in Escribe and out of the box my cells were at 0.8V, 0.9V, and 3.1V. I'm currently waiting to see if Vapordna is going to swap me out or if I'll have to go through Lost Vape.