The three sizes in this kit make it easy to work up gradually instead of jumping straight to the biggest one. The glass is completely smooth with no seams, and cleanup takes about a minute under warm water.
The glass warms up to body temperature way faster than I expected, which made the first session way less intimidating. I like that there are three sizes to work through instead of guessing which one to buy, and the smooth surface cleans up in seconds. Honestly a solid kit for the price.
The three graduated sizes made starting out way less intimidating than I expected, and the glass glides with barely any lube needed. Rinsing them off takes seconds, which honestly matters more than I thought it would.