The function is outstanding and looks beautiful, can tank big globs with ease. Heat retention is pretty well on these but I would recommend using a ruby pill or pearl, maybe even a valve as well if you’re tying to go lower temp. From my experience 530-550 Fahrenheit is the sweet spot for these pearls but can go low as 420-450 on a ruby pill. The marble is outstanding and the valve is on point, wish the pill was a little thicker for less wiggle room, overall a great investment.