Here's where I'm at feature-wise:
I'm not quite ready to open sign ups to the public internet, but I sent out a marketing email to handful of my earliest adopters - people I feel like would appreciate having been invited so early and maybe even up for giving feedback.
One thing I'm struggling with is the upfront payment requirement. It feels like a lot of friction before any value is realized. My primary motivator for that is to prevent any issues with spam. My previous product was constantly fighting different spam-related issues and I definitely do not want to do that again.