Started vaping on March 1st of this year. Here is my experience so far....
RN4075 Atomizers:
First one worked good the first 24 hours and weak vapor after that. I tried various cleaning tricks and eventually it died.
Second one died with-in a week. During exploratory surgery I found that a soldered wire let loose on the brass base. Unfortunately I couldn't put it back together as it was damaged during surgery.
Third one died as the result of being cooked. The battery came on mysteriously while changing carts. Snap, crackle, pop. Otherwise this atty lasted a month
DSE901 Atomizers:
First one lasted 21 days before I cooked it. I found the button stuck on my USB Pass Through with a manual switch when I walked back into the room. Snap, crackle, fizzle for about 30 seconds. It still worked, but weak vapor. Surgery revealed the most of the wicking fibers inside the coil came out.