PX70 FF-Currently awful, (i heard they have another version, but are waiting for the old stuff to sell out) but fun to play around with. Not sensitive to temperature (especially the high side) but very sensitive to light. Cover it. Produces colors in full sun, a more monochromatic image in shade or shadow or cloud.
PX100-A very nice monochrome film. Minimal artifacts, sensitive to temperature and moderately to light. Turns sepia with over temperature. This has been corrected somewhat for the new PX600 film.
Once they correct their opacifier this will be much more fun to shoot.
The general idea- FF (first flush) means bad film, but selling it to get money. V01 (version, followed by number.) If it has solely the product name it is a more final version, though they seem to constantly improve.