It certainly scratched my personal itch for something that lets you relate/encode/recall information in 3D but also work in 2D.

The primary feedback from friends has been it's cool, but hard to use without much of UI (current version is all shortcut keys). That's something I can fix in the next couple of weeks.

A harder problem is there's a decent chunk of knowledge workers with no experience navigating virtual 3D spaces. If you didn't grow up playing Quake, Minecraft etc you might find Temin frustrating to use for a little while.