Any info on the Starpath Supercharger?

I picked up some miscellaneous stuff today. I can google some stuff about it, but it only takes me so far. I was hoping I could get a little help from the wise collectors and historians around here, as I've noticed sometimes a single person on Atari Age knows more than a search engine on particular topics.

Any info is appreciated- history, function, use, rarity, current value, etc.

Thank you!