I was able to get back to shooting my Vivitar Ultra Wide and Slim thanks to the gift of a roll of Agfa Vista 100. The use-by date was 2007, but I thought the colors looked pretty good with a little PhotoShop help.
I found I had forgotten a few things about shooting the little wide-lens Vivitar. It is necessary to frame scenes tightly as the viewfinder shows less than what will appear on the film. Keeping the camera level is also important to avoid out of control verticals.
I have another roll of the Agfa Vista. I'll probably give it an additional minute or two in the developer to compensate for the film age as well as the depletion of the Cinestill C-41 which will be on its fourteenth roll.