I've had the Nautilus mini for 6 days. On the 2nd day I had problems with the coil getting stuck to the top piece when I unscrewed the base to refill the tank, I just ignored it because it was still refillable. After getting a burnt taste today I tries to change coils, and it was stuck again. After trying to unscrew it, the glass broke on my hand and cut into my finger. I truly saw potential in this product and hope this coil issue gets fixed and the Pyrex glass is made more durable. Pyrex glass already being quite "durable" I have no idea how the tension from my hand may have broken it, but I am very disappointed.