1) higher amp limit
2) Provari brand beauty rings to make a flat top. It would be nice if they did not fall off when you take your tank/atomizer off the top.
3) crop circles are OK, but the raindrops on the mini are much better looking
4) get rid of the slick finish I have on my red Provari. The finish of my blue Provari is not slick, and holds better in my hand
5) adjustable center pin for the 510 connection