A pico is the mod I primarily use because it has TC and is small. I've had two problems. I damaged the USB port on one of them and I'll call that my fault. The second problem has been falling out of TC mode to watts mode. I haven't ruled out a problem on my side with the atomizer or build. An atomizer with the same build and settings was a problem on the pico but not several other devices but now with a new build on a different atomizer no problems for some days. The Pico is my favorite form factor.