The kit I would really like to have is at least fifty times the price
The difference is the one 50x the price would actually work (for astronomy) 😉
Beyond the introductory Star Analyser at ~ the same price as this, for around £1k you can get a pretty capable and versatile 3D printed astronomical spectrograph kit, the StarEx
http://www.astrosurf.com/solex/sol-ex-stars-en.html
The optical components are supplied by Shelyak and you can get the 3D components as a kit if you don’t want to print them yourself
Cheers
Robin