Having shot a number of rolls, Cinestill offers 800T, 50D and BwXX (of either 200 or 250 speed depending upon light conditions. Essentially cine film with the remjet layer removed.
Tech Alert - (Remjet, a removable jet black layer, is the coating of carbon black particles in a water-soluble binder on the bottom of the film. It has four purposes: anti-halation, antistatic, lubrication,and scratch protection. Light entering the film can reflect off the front or back surface of the film base and return into the imaging layers to expose them. When light spreads laterally beyond its intended boundary, an image appears to have a halo around it (halation). The anti-halation layer prevents this by absorbing light that reaches it. The remjet carbon layer is conductive and prevents the build-up and discharge of static charges that can fog film. This is especially important in conditions of low relative humidity. Rem-jet also has lubricating properties. Like the supercoat on top of the emulsion, remjet resists scratching on the base side and helps transport the film through cameras, scanners, and printers. --Kodak)
Both day and night have their different colours, I probably prefer night / dusk. Although I haven't really shot much of the 800T during the day and probably won't. Being that it is definitely obviously suited to tungsten lighting / artificial.