Double-X is a wonderful film! Responds well in HC-110 B, although rather grainy. I've started using Xtol (both stock and 1+1) with fantastic results (Exposing at ASA-250). I've signed up for a box of 50 from Keith! Cost 90$ which is a fair price point. When I had signed up the total was up to 6. Examples below from the 35mm stock.

HC-110


Xtol (Stock)


Xtol (1+1)