I'm using a Bull's
mod tru-stone and a Sagewood Glass tip on my two AGA's.
Only have this pic of the white Bull's
mod tip on the Provari, but it's now sitting on my white Silver Bullet. Close up of a Bull's mod tip I really wanted but missed out on it, shown only for the shape detail of the one I actually have.

I use this tip on the other AGA just because its the most comfortable tip I own. I prefer the feel of glass or tru-stone on my lips, and I prefer this shape. Looking for a similar shaped drip tip to match the blue of my Provari. Considering a tru-stone from DripTipDesignz, but haven't seen the right color yet.
http://www.driptipdesignz.com/tru-stone.html