What's the difference between Simula One, Simula One Tethered Edition and Founder Edition?

Simula One: headset + compute pack, works standalone

Simula One Tethered Edition: just the headset, needs a host PC

Simula One Founders Edition: headset + compute pack, works standalone, has extra bling (and potentially slightly better specs as they can make more lead time vs cost tradeoffs)