I rewicked one of the Griffins for silica wick and it too is performin admirably. The ohms are a bit too high on this one, though - the Vivi has the neg hole very close to the wick hole, whereas the Griffin a bit farther apart. I used the same amount of coils and 34 Kanthal, so that extra amount of bottom leg upped the ohms. I'm just running at a higher voltage.
What I like about the silica is I don't have to point the airhole downwards. I've tried it in all positions and get no dry hits. (Try that with your mesh and see what happens)
That is one of my pet peeves about the mesh - you have to have the hole down. So if your atty does not fit on your divice perfectly, the fire button can end up in an unergonomic (non-firebutton friendly) position. I like it when my button is either straight up or preferably, straight down, firing with my thumb.
I have had my tank almost empty and had to slosh some juice to get the wick wetter; not really a dry hit, but not quite wet enough for the good flavor - a minor drawback. Or go back to the airhole down, I guess.
I have also played with the hole size and, for me, a little tighter draw provides the best flavor, a little airier, more vapor. I hope to find a happy medium.
No hot spots or shorts, ever. Rigged up two so far and both were easy setups. And you can really get the wick and top leg as close as you want without fear of shorting.
So far I'm kind of liking it, but I need more usage to see if it is going to replace my mesh.