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How do I take it for a spin? The launch announcement(?) contains images, video, and write up but I can’t seem to find a link to try it out.

There’s a link to “WriteSonic”, but that website doesn’t mention ChatSonic.

Looks like they should've linked to https://writesonic.com/chat

Signing up with Google is failing for me though, so I may never know how cool it is.

I faced the same issue. Turns out, you need to disable ad-blocker in order to be able to sign-up with a Google account.