Cinestill is a company based in Los Angeles that converts Kodak Motion Picture film to photographic film stock. Motion picture film is processed with the ECN-2 process that is not available in photographic labs. Therefore, Cinestill has to chemically modify the film, removing the so-called remjet layer. The removal of this layer leads to the formation of strong red halos around highlights in the image.
As the T in the name indicates, this film is white-balanced for incandescent tungsten lighting. Using it in daylight will result in a strong blue cast. Cinestill 800T has a very distinct look with its blue to green color cast and red halation. This can make the film appear as a one-trick pony. However, the selection of fast color films on the market is not large, and the only alternative I am aware of is Kodak Portra 800, so that Cinestill 800T is regularly used for low light photography.