Yes it dual boots, I have one. The issue is that only last week they got the modem to work under Linux and there are still many open issues. I wish they opened their development including Android as there are issues that the community could fix much faster.

As for use cause. I don't know. Nice to have a keyboard but I'm carrying two phones around now which is kind of stupid. The front display it total garbage, slow ui and useless.

Their next model seems more practical as the screen is on the outside allowing use without having to fold open the keyboard which is kind of annoying on the gemini.