I have used most of their films at least once. After a number of failed color SX-70 films, they had a remarkable film in their first ASA 600 color film, the "beta" PX680 test film that came out about a year ago. Those still look like I just shot them yesterday. However, every subsequent film has something a bit more to be desired. Their latest release, the "Cool" films, are simply the existing formulations with all the components cold-stored at every single step in production.
For whatever reason, their Spectra films seem to be some of the best, rather than the 600 and SX-70 films.
I like to buy a couple packs every few months (maybe 3-4 times a year) and use them sparingly, but always for fun. I am really pulling for their success and will promote their efforts as much as possible... just not with the full force of my wallet (which isn't very forceful to begin with, if you catch my drift.)