I obtained several expired rolls of Konica 120 IR film a couple of years ago. It had expired around '93, but some of the rolls developed very nicely. I shot it using a red 25A filter, and developed it in D76.
I'm definitely a Konica camera fan, and have a couple of bodies (TC-X and an Autoreflex T3), and a number of lenses in my collection. I've noticed that the Konica groups on Flickr seem to be dominated by Asian shooters, so I suppose they were more popular outside the US. Konica glass does seem to be especially contrasty, in a good way.