The angled bowls (buddy and AIW) are not only thicker glass, you don't need the washer. AIW bowl is :thumbsup::thumbsup:. Careful with the straight bowl. If it gets accidentally jammed down into the vape it'll go through the bottom of the heating chamber and you're out of business. If you do have an accident though, the Vapolution guys will replace it for $50, and since you stole it for $45, you'd still have less invested than the price of a new one.