Click on the play button to here my quick review of this film.

From the FAQ page at CineStill Film

Use CineStill 800Tungsten when photographing:
   – tungsten/incandescent light
   – candle light
   – fluorescent light
   – mixed tungsten and fluorescent
   – mixed tungsten and limited daylight

Avoid using CineStill 800Tungsten (or expect a unique look) when photographing:
   – open shade
   – cool light
   – daylight overpowering tungsten
   – heavily backlit images
   – strong window light
   – content including intense points of light (christmas lights, chandeliers, neon signs, bright windows)    

Here is a difficult test shot I did… I was quite impressed and this is pushed to EI 3200!!!!!! Max usable EI in my opinion is around 6400 with a 2 stop push….