I acquired this from another grower's collection liquidation about 3 years ago, more-or-less, as a NBS single growth.
I immediately stuck it in S/H culture, although the LECA I used (a gray product called Geolite) does not seem to hold as much water or wick as well as others. When it has stopped blooming, this plant is going into Hydroton.
Paph. stonei is a large plant (16"-18" leaves) but a very slow grower, and I only have one addition growth at the moment. Supposedly they do better as the colony matures.