Frame rates were low because of limited rendering speed and tracker lag. I did a lot of VR demos starting in 1989 at Autodesk. Not much motion sickness, perhaps 2% of users. The first HMD we used at Sense8 was by Virtual Research (Bruce Bassett) with LEEP optics. And I just found out that John Ternus worked for Bruce. Small planet.

Beyond tech demos, yes, lots of customers of the WorldToolKit product. From NASA to artist Jenny Holzer. Sense8 was acquired in 1998 by Engineering Animation.