It's a nifty little widget ... you attach it to a can o' compressed air, turn on the nozzle at the can end, then use the little grip trigger to psssht! air over the marker nib, spraying ink in a remarkably airbrush-like manner.
Only snag: it only works with Trias.
90% of my markers are Prismacolors.
So now I'm trying to decide if I should put the Prismacolors up on eBay and buy myself a set of Trias instead.
For that matter, anybody want a slightly-used set of Prismacolors for, say, $175?